0000000000449709

AUTHOR

Alfonso Carmelo Cino

showing 142 related works from this author

One diode circuital model of light soaking phenomena in Dye-Sensitized Solar Cells

2018

Abstract In this work, we report on the modelling of light soaking effect on Ruthenium-based Dye Sensitized Solar cells (DSSCs). Such a phenomenon can be detected when exposing the cells at increasing hours of illumination and produces a reversible performance increase. Starting from the results obtained through the electro-optical characterization of the cells, we applied a one-diode circuital-model. Our results show a good agreement between the experimental and the simulated data, with a mean square error in the order of 10−12 and a maximum error in current lower than 0.6%. Finally such results allowed us to infer some precise trends followed by the cells main electrical parameters and of…

Dye sensitized solar cells (DSSCs)Materials scienceAtomic and Molecular Physics and OpticElectrical modelchemistry.chemical_element02 engineering and technologyElectro-optical characterization010402 general chemistry01 natural sciencesMaximum errorSettore ING-INF/01 - ElettronicaPhotovoltaicsParameters estimationElectrical and Electronic EngineeringDiodebusiness.industryElectronic Optical and Magnetic MaterialLight soaking021001 nanoscience & nanotechnologyAtomic and Molecular Physics and Optics0104 chemical sciencesElectronic Optical and Magnetic MaterialsRutheniumDye-sensitized solar cellchemistrySimulated dataOptoelectronics0210 nano-technologybusinessOne-diode modelPhotovoltaic
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Silica masks for improved surface poling of lithium niobate

2005

Surface periodic poling of congruent lithium niobate was performed with the aid of photolithographically defined silica masks. The latter helped improving the control of duty cycle in the periodic domain poling, with 50:50 mark-to-space ratios. The role of silica was ascertained by numerically solving the Poisson equation.

Materials sciencebusiness.industryPolingLithium niobatePolarization (waves)law.inventionchemistry.chemical_compoundOpticschemistryDuty cyclePeriodic polinglawOptoelectronicsElectrical and Electronic EngineeringPhotolithographyPoisson's equationbusiness
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On-chip frequency combs and telecommunications signal processing meet quantum optics

2018

Entangled optical quantum states are essential towards solving questions in fundamental physics and are at the heart of applications in quantum information science. For advancing the research and development of quantum technologies, practical access to the generation and manipulation of photon states carrying significant quantum resources is required. Recently, integrated photonics has become a leading platform for the compact and cost-efficient generation and processing of optical quantum states. Despite significant advances, most on-chip nonclassical light sources are still limited to basic bi-photon systems formed by two-dimensional states (i.e., qubits). An interesting approach bearing …

Quantum opticsentangled photonComputer sciencebusiness.industryquantum opticElectronic Optical and Magnetic MaterialSettore ING-INF/02 - Campi Elettromagnetici01 natural sciencesElectronic Optical and Magnetic Materials010309 opticsQuantum technologyQC350Coherent controlQuantum stateQubitnonlinear optic0103 physical sciencesNonclassical lightElectrical and Electronic EngineeringPhotonics010306 general physicsbusinessQuantum information scienceTelecommunications
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Dual-polarization-pump CW laser operation in Nd3+:LiNbO3 channel waveguides fabricated by reverse proton exchange

2008

Abstract In this work, continuous-wave laser action at 1084.5 nm at room temperature in LiNbO 3 :Nd 3+ channel waveguides, fabricated by reverse proton exchange (RPE), is reported. The sample was pumped at λ  = 808 nm in either σ or π-polarized configurations, TE- and TM-pumping schemes, being the laser emission π-polarized at all power levels. The laser characteristics, as function of the pumping scheme (TE or TM), have been obtained. In both cases, the laser emission was stable, without any reduction in the output power even under continuous pump operation at maximum power at room temperature, indicating high resistance to photorefractive damage.

Nd3+Maximum power principleProtonLithium niobateReverse proton exchangeLaserLiNbO3Waveguide (optics)law.inventionInorganic Chemistrychemistry.chemical_compoundOpticslawLaser power scalingElectrical and Electronic EngineeringPhysical and Theoretical ChemistrySpectroscopyChemistrybusiness.industryOrganic ChemistryIntegrated opticPhotorefractive effectLaserAtomic and Molecular Physics and OpticsElectronic Optical and Magnetic MaterialsDual-polarization interferometryWaveguideRPEbusiness
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Second-harmonic generation in surface periodically poled lithium niobate waveguides:On the role of multiphoton absorption

2008

Second harmonic generation is investigated in lithium niobate channels realized by proton exchange and quasi-phase-matched by surface periodic-poling. The reduction in conversion efficiency at high powers is interpreted in terms of multi-photon absorption via two-color terms, yielding an estimate of the dominating three-photon process.

Surface (mathematics)Materials sciencePhysics and Astronomy (miscellaneous)Protonbusiness.industryLithium niobateEnergy conversion efficiencyGeneral EngineeringGeneral Physics and AstronomySecond-harmonic generationFOS: Physical sciencesPhysics::Opticschemistry.chemical_compoundchemistryOptoelectronicslithium niobate channel multi-photon absorptionbusinessAbsorption (electromagnetic radiation)Physics - OpticsOptics (physics.optics)
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Generation and Coherent Control of Pulsed Quantum Frequency Combs

2018

We present a method for the generation and coherent manipulation of pulsed quantum frequency combs. Until now, methods of preparing high-dimensional states on-chip in a practical way have remained elusive due to the increasing complexity of the quantum circuitry needed to prepare and process such states. Here, we outline how high-dimensional, frequency-bin entangled, two-photon states can be generated at a stable, high generation rate by using a nested-cavity, actively mode-locked excitation of a nonlinear micro-cavity. This technique is used to produce pulsed quantum frequency combs. Moreover, we present how the quantum states can be coherently manipulated using standard telecommunications…

0301 basic medicineDensity matrixOptics and PhotonicsPhotonGeneral Chemical EngineeringSettore ING-INF/01 - ElettronicaGeneral Biochemistry Genetics and Molecular Biology03 medical and health sciencesEngineering0302 clinical medicineQuantum stateQuantum DotsQuantumQCQuantum opticsPhysicsGeneral Immunology and Microbiologybusiness.industryGeneral NeuroscienceNonlinear opticsSettore ING-INF/02 - Campi Elettromagnetici030104 developmental biologyCoherent controlQuantum optics Integrated photonic devices Mode-locked lasers Nonlinear optics Four-wave mixing Frequency combs High- dimensional statesFrequency domainOptoelectronicsbusiness030217 neurology & neurosurgeryJournal of Visualized Experiments
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Multi-line NIR-RGB emission in Nd:LiNbO3 RPE optical waveguides

2007

Simultaneous generation of four spectral emission lines has been achieved in Nd-doped lithium niobate reverse proton exchange optical waveguide cavities. Using a pump at 800 nm, the four lines were found and they are due to lasing at 1.3735 combined with parametric conversion at 0.687, 0.574 and 0.4 mum.

PhotoluminescenceMaterials scienceProtonbusiness.industryLithium niobatechemistry.chemical_elementNeodymiumion exchange lithium compounds neodymium optical pumping optical waveguides photoluminescenceSettore ING-INF/01 - ElettronicaOptical pumpingchemistry.chemical_compoundOpticschemistryRGB color modelElectrical and Electronic EngineeringbusinessLasing thresholdLine (formation)
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Layout influence on microwave performance of graphene field effect transistors

2018

The authors report on an in-depth statistical and parametrical investigation on the microwave performance of graphene FETs on sapphire substrate. The devices differ for the gate-drain/source distance and for the gate length, having kept instead the gate width constant. Microwave S -parameters have been measured for the different devices. Their results demonstrate that the cut-off frequency does not monotonically increase with the scaling of the device geometry and that it exists an optimal region in the gate-drain/source and gate-length space which maximises the microwave performance.

TechnologyMaterials science02 engineering and technologyHardware_PERFORMANCEANDRELIABILITYSettore ING-INF/01 - Elettronica01 natural scienceslaw.inventionComputer Science::Hardware ArchitectureComputer Science::Emerging Technologieslaw0103 physical sciencesHardware_INTEGRATEDCIRCUITSElectrical and Electronic EngineeringScaling010302 applied physicsbusiness.industryGrapheneComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKSWide-bandgap semiconductorSettore ING-INF/02 - Campi Elettromagnetici021001 nanoscience & nanotechnologyGraphene field effect transistorsSapphire substrateOptoelectronicsField-effect transistorGraphene0210 nano-technologyConstant (mathematics)businessMicrowaveddc:600MicrowaveHardware_LOGICDESIGN
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Ultraviolet quasi-phase-matched second harmonic generation in surface periodically poled lithium niobate optical waveguides

2007

The compatibility of low concentration (alpha-phase) proton exchange channel waveguides with electric field surface periodic poling of congruent lithium niobate (SPPLN) crystals has been experimentally demonstrated. With such waveguides, we obtained ultraviolet second harmonic generation (SHG) by first order quasi-phase-matching (QPM), a result made possible by the fabrication, on Z-cut LN crystals, of periodic structures with a pitch down to 750 nm. Nonlinear copropagating QPM-SHG measurements have been carried out on such structures. The pump source was a Ti:sapphire laser with a tunability range of 700-980 nm and a 40 GHz linewidth. We have measured UV continuous wave light at 390 nm by …

Quasi-phase-matchingMaterials sciencebusiness.industryLithium niobateSecond-harmonic generationNonlinear opticsCondensed Matter PhysicsLaserIndustrial and Manufacturing EngineeringAtomic and Molecular Physics and Opticslaw.inventionQPM SHG PPLN Optical Waveguides Nonlinear Opticschemistry.chemical_compoundLaser linewidthOpticschemistryPeriodic polinglawContinuous wavebusinessInstrumentationLaser Physics
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On-chip generation of high-dimensional entangled quantum states and their coherent control

2017

Optical quantum states based on entangled photons are essential for solving questions in fundamental physics and are at the heart of quantum information science1. Specifically, the realization of high-dimensional states (D-level quantum systems, that is, qudits, with D > 2) and their control are necessary for fundamental investigations of quantum mechanics2, for increasing the sensitivity of quantum imaging schemes3, for improving the robustness and key rate of quantum communication protocols4, for enabling a richer variety of quantum simulations5, and for achieving more efficient and error-tolerant quantum computation6. Integrated photonics has recently become a leading platform for the co…

Quantum opticFiber optics communicationQuantum imaging01 natural sciencesSettore ING-INF/01 - Elettronica010309 opticsOpen quantum systemQC350Quantum mechanics0103 physical sciencesQuantum information010306 general physicsQuantum information scienceQCSingle photons and quantum effectQuantum computerPhysicsQuantum networkMultidisciplinaryTheoryofComputation_GENERALIntegrated opticSettore ING-INF/02 - Campi ElettromagneticiQuantum PhysicsQC0350Quantum technologyPhotonicsQuantum teleportation
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Generation and coherent manipulation of complex quantum states based on integrated frequency combs

2018

The investigation and use of integrated frequency comb sources (i.e. featured by equally-spaced discrete spectral modes) have recently provided a unique framework to address the challenges of generation and coherent manipulation of complex quantum states in on-chip devices. We exploit integrated frequency combs for generating entangled photon pairs, as well as multi-photon states, and high-dimensional (D-level, i.e. quDit) entangled photons. In particular, we manage to coherently manipulate such complex quantum systems by using telecommunications components (standard fiber telecom).

Quantum opticsPhysicsFrequency combPhotonPhoton entanglementbusiness.industryQuantum stateFiber (mathematics)Physics::OpticsOptoelectronicsNonlinear opticsbusinessQuantum2018 Photonics in Switching and Computing (PSC)
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Scalable and effective multi-level entangled photon states: a promising tool to boost quantum technologies

2021

Abstract Multi-level (qudit) entangled photon states are a key resource for both fundamental physics and advanced applied science, as they can significantly boost the capabilities of novel technologies such as quantum communications, cryptography, sensing, metrology, and computing. The benefits of using photons for advanced applications draw on their unique properties: photons can propagate over long distances while preserving state coherence, and they possess multiple degrees of freedom (such as time and frequency) that allow scalable access to higher dimensional state encoding, all while maintaining low platform footprint and complexity. In the context of out-of-lab use, photon generation…

Photonintegrated and cost-efficient photonic platformComputer sciencephoton cluster statesQC1-999Context (language use)witness operatorsQuantum entanglementQuantum channelquantum photonicsphoton cluster stateRobustness (computer science)Electronic engineeringElectrical and Electronic EngineeringQCbusiness.industryexperimentally feasible entanglement characterizationPhysicsSettore ING-INF/02 - Campi Elettromagneticicomplex entanglementAtomic and Molecular Physics and OpticsElectronic Optical and Magnetic MaterialsQuantum technologyintegrated and cost-efficient photonic platformsPhotonicsbusinessquantum photonicBiotechnologyCoherence (physics)
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Time resolved confocal luminescence investigations on reverse proton exchange Nd : LiNbO3 channel waveguides

2009

In this work we report on the time and spatial resolved fluorescence of Neodymium ions in LiNbO(3) channel waveguides fabricated by Reverse Proton Exchange. The analysis of the fluorescence decay curves obtained with a sub-micrometric resolution has evidenced the presence of a relevant fluorescence quenching inside the channel waveguide. From the comparison between diffusion simulations and the spatial dependence of the (4)F(3/2) fluorescence decay rate we have concluded that the observed fluorescence quenching can be unequivocally related to the presence of H+ ions in the LiNbO(3) lattice. Nevertheless, it turns out that Reverse Proton Exchange guarantees a fluorescence quenching level sig…

Laser materialsQuenching (fluorescence)Materials scienceLITHIUM-NIOBATE CRYSTALSbusiness.industryFísicaPhysics::Opticschemistry.chemical_elementFluorescence correlation spectroscopyLithium niobateNeodymiumFluorescenceLINBO3Atomic and Molecular Physics and OpticsOpticschemistryFluorescence cross-correlation spectroscopyLaser-induced fluorescenceSpectroscopyLuminescencebusiness
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Integrated optic surface plasmon resonance measurements in a borosilicate glass substrate

2008

The surface plasmon resonance (SPR) technique is a well-known optical method that can be used to measure the refractive index of organic nano-layers adsorbed on a thin metal film. Although there are many configurations for measuring biomolecular interactions, SPR-based techniques play a central role in many current biosensing experiments, since they are the most suited for sensitive and quantitative kinetic measurements. Here we give some results from the analysis and numerical elaboration of SPR data from integrated optics experiments in a particular borosilicate glass, chosen for its composition offering the rather low refractive index of 1.4701 at 633 nm wavelength. These data regard the…

Physics::OpticsSubstrate (electronics)Biosensors; Integrated Optics; Surface Plasmon Resonancelcsh:Chemical technologyBiochemistryArticleAnalytical Chemistrylaw.inventionOpticslawSurface plasmon resonancelcsh:TP1-1185Electrical and Electronic EngineeringSurface plasmon resonanceThin filmInstrumentationChemistrybusiness.industryBorosilicate glassIntegrated opticsAtomic and Molecular Physics and OpticsWavelengthBiosensorsbusinessBiosensorRefractive indexWaveguideSensors
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Refractive index sensing by a silicon metasurface

2022

The availability of smart materials represents a key enabling milestone for the realization of smart sensors. In this research field, optical sensing has gained a lot of attention in various applications ranging from basic physics to chemistry and biology. Here, we exploit the non-invasive nature of light to achieve an innovative sensor based on all-optical dielectric nano-resonators arranged in a periodic fashion. The proposed sensor can measure refractive index changes up to 10(-6).

optical sensingrefractive indexdielectric metasurfacesmart sensorsiliconSettore ING-INF/02 - Campi Elettromagneticidielectric metasurface; optical sensing; refractive index; silicon; smart sensor2022 IEEE 21st Mediterranean Electrotechnical Conference (MELECON)
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Second Harmonic Emission From Dielectric Nanoresonators in the Absorption Regime

2023

We study second harmonic generation in dielectric nanocylinders as a function of the wavelength of the incident field and geometrical dimensions. Uncommonly, we consider a spectral range in which the emitted nonlinear signal is partially absorbed by the dielectric. Surprisingly, we reveal that the second harmonic efficiency does not decrease as the imaginary part of the complex dielectric refractive index increases. Indeed, the presence of higher order multipoles supported by the resonators at the fundamental wavelength can significantly boost the generated second harmonic signal even in the dielectric absorption spectral region achieving nonlinear efficiency of the same order of magnitude …

nanoresonatorSettore ING-INF/02 - Campi ElettromagneticiSecond harmonic generationElectrical and Electronic EngineeringdielectricabsorptionAtomic and Molecular Physics and OpticsElectronic Optical and Magnetic Materials
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On-chip Generation, Coherent Control and Processing of Complex Entangled Photon States

2019

We demonstrate the on-chip generation of time-bin entangled two- and multi-photon qubit states, as well as high-dimensional frequency-entangled photon pairs. Combining time and frequency entanglement, we generate high-dimensional optical cluster states and implement proof-of-concept high-dimensional one-way quantum computing. This, by using standard, fiber-based telecommunication components.

PhysicsPhotonbusiness.industryFiber (mathematics)TheoryofComputation_GENERALPhysics::OpticsQuantum Physics02 engineering and technologyQuantum entanglement021001 nanoscience & nanotechnology01 natural sciencesCoherent controlQubit0103 physical sciencesCluster (physics)Optoelectronics010306 general physics0210 nano-technologybusinessQuantum computer2019 IEEE Photonics Society Summer Topical Meeting Series (SUM)
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Kerr Combs and Telecommunications Components for the Generation and High-Dimensional Quantum Processing of d-Level Cluster States

2019

Large and complex optical quantum states are a key resource for fundamental science and applications such as quantum communications, information processing, and metrology. In this context, cluster states are a particularly important class because they enable the realization of universal quantum computers by means of the so-called ‘one-way’ scheme, where processing operations are performed through measurements on the state. While two-level (i.e. qubit) cluster states have been realized thus far, further boosting this computational resource by increasing the number of particles comes at the price of significantly reduced coherence time and detection rates, as well as increased sensitivity to …

business.industryQuantum stateComputer scienceQubitElectronic engineeringQuantum entanglementQuantum channelPhotonicsbusinessComputational resourceQuantum information scienceQuantum computer2019 21st International Conference on Transparent Optical Networks (ICTON)
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Universal multipartite d-level entanglement witnesses for realistic measurement settings

2019

Entanglement is an essential resource in quantum information science [1] and its presence in any quantum system can be experimentally detected through entanglement witness operators [2]. In particular, measuring a negative expectation value of a witness with high statistical confidence provides a necessary and sufficient condition to confirm the generation of a genuine multipartite [3] and/or d-level entangled state [4]. In recent years, the experimental generation of complex quantum states has intensified the need for witnesses that are capable of detecting such systems and are experimentally optimal at the same time. This means that the witness should require the least measurement effort …

Theoretical computer scienceComputer scienceExpectation valueQuantum entanglement01 natural sciences010305 fluids & plasmasMultipartiteQuantum state0103 physical sciencesQuantum systemQuantum information010306 general physicsQuantum information scienceEntanglement witness
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An electrochemical route towards the fabrication of nanostructured semiconductor solar cells

2010

This work presents our preliminary results regarding an electrochemical process which allows the growth of nanostructured materials by means of nanopore templates. Also we analyze possible applications of this process to fabricate nanostructured semiconductors, such as CIGS, suitable for photovoltaic devices, and we consider the implications from the perspective of characterization techniques and device modelling when using such a technology.

NanoporeSemiconductorNanolithographyFabricationMaterials sciencebusiness.industryPhotovoltaic systemNanowireCIGS Electrochemical Deposition Nanostructured Semiconductors Solar CellsNanotechnologybusinessCopper indium gallium selenide solar cellsCharacterization (materials science)
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High-dimensional one-way quantum processing implemented on d-level cluster states

2019

Taking advantage of quantum mechanics for executing computational tasks faster than classical computers1 or performing measurements with precision exceeding the classical limit2,3 requires the generation of specific large and complex quantum states. In this context, cluster states4 are particularly interesting because they can enable the realization of universal quantum computers by means of a ‘one-way’ scheme5, where processing is performed through measurements6. The generation of cluster states based on sub-systems that have more than two dimensions, d-level cluster states, provides increased quantum resources while keeping the number of parties constant7, and also enables novel algorithm…

PhysicsQuantum opticsQuantum opticsQuantum informationGeneral Physics and AstronomySettore ING-INF/02 - Campi ElettromagneticiQuantum entanglementTopologySettore ING-INF/01 - Elettronica01 natural sciences010305 fluids & plasmasMicroresonatorQuantum state0103 physical sciencesCluster (physics)Quantum information010306 general physicsQuantum information scienceQuantumQCQuantum computerNature Physics
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Modelling of Laser Operation in RPE Nd3+:LiNbO3 Channel Waveguides

2006

In this work, laser action in RPE Nd3+:LiNbO3 is modelled by using the overlapping integrals method. Different pumping schemes, TE or TM, have been considered in order to reproduce the experimental measurements. Calculated results indicate that the slope efficiency remains basically independent on the pumping scheme while the threshold pump power increases for TE pumping.

Waveguide lasersWork (thermodynamics)Materials sciencebusiness.industrySlope efficiencyPhysics::Opticschemistry.chemical_elementLaserNeodymiumPower (physics)law.inventionOptical pumpingOpticschemistrylawbusiness
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Integrated optic Surface Plasmon Resonance Measurements in Glass substrates

2007

The surface plasmon resonance (SPR) technique is an optical method that can be used to measure the refractive index of organic nano-layers adsorbed on a thin metal film. Although there are many techniques for measuring biomolecular interactions, SPR-based techniques play a central role in many current biosensing experiments, since they are most suited to sensitive and quantitative kinetic measurements. Here we give some results from the analysis and numerical elaboration of SPR data regarding the flow of different solutions with refractive indexes in the range of interest (1-1.4). After a brief discussion of the principles of SPR and of waveguide fabrication technique, we give a description…

FabricationOpticsFiber optic sensorbusiness.industryChemistrySurface plasmonSurface plasmon resonanceThin filmbusinessBiosensorWaveguide (optics)Refractive index
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Fabrication and Characterisation of Reverse Proton Exchange Optical Waveguides in Neodymium Doped Lithium Niobate Crystals

2005

In this work, the complete fabrication process which combines Proton Exchange (PE) and Reverse Proton Exchange (RPE) in Neodymium doped LiNbO3 channel waveguides is reported. To produce the PE-RPE channel waveguides the fabrication of dielectric SiO2 masks had to be implemented. For this propose, we adopted a technique based on the Ion Plating Plasma Assisted Deposition of SiO2 followed by the standard ultraviolet photolithographic patterning. On the other hand, we determined the main optical and spectroscopic properties of Nd3+ ions in the channel waveguides including the study of the lifetime as function as the polarisation.

FabricationMaterials scienceProtonlithium niobateMechanical EngineeringDopingIon platingLithium niobateAnalytical chemistryPhysics::Opticschemistry.chemical_elementDielectricCondensed Matter PhysicsCrystalsWaveguide (optics)NeodymiumCondensed Matter::Materials Sciencechemistry.chemical_compoundchemistryMechanics of MaterialsGeneral Materials ScienceErbiumMaterials Science Forum
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Numerical analysis of light soaking phenomenon in Ruthenium based Dye Sensitized Solar Cells

2017

Dye Sensitized Solar Cells (DSSCs) are widely considered one of the most promising third generation photovoltaic devices, especially thanks to their relatively low cost if compared to conventional solar cells. An interesting phenomenon affecting such devices is the so-called light soaking effect, consisting in the increase of cell main electrical parameters after the exposition to solar light. In this work, starting from the experimental characterization carried out on Ruthenium-based DSSCs, we report on a series of numerical analysis performed to better describe the above-mentioned light soaking effect in order to show the relationship between such phenomenon and the main physical paramete…

Materials sciencebusiness.industryRenewable Energy Sustainability and the Environment020209 energyNumerical analysisPhotovoltaic systemDye Sensitized Solar Cellchemistry.chemical_elementEnergy Engineering and Power TechnologySettore ING-INF/02 - Campi Elettromagnetici02 engineering and technologylight soakingSettore ING-INF/01 - ElettronicaThird generationRutheniumphotovoltaicDye-sensitized solar cellnumerical modelingchemistrySimulated dataSolar light0202 electrical engineering electronic engineering information engineeringOptoelectronicsSpontaneous emissionbusiness
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Nanopatterned ferroelectric crystals for parametric generation

2006

We report on recent results by surface periodic poling on lithium niobate and lithium tantalate. Such approach allows periodic inversion of the second order susceptibility with nanoscale features using insulating masks. We achieved a world-best 200 nm feature size, as well as good compatibility with alpha-phase proton exchanged channel waveguides in lithium niobate. Preliminary results of surface periodic poling in lithium tantalate also show similar characteristics. Surface poling is best suited for integrated optics devices in technologically-demanding configurations such as backward second harmonic generation and counter propagating optical parametric amplification

Nonlinear integrated opticsOptical frequency multiplierMaterials sciencebusiness.industryParametric generationPolingLithium niobateSecond-harmonic generationPhysics::OpticsLithium tantalateSurface periodic polingLithium niobateFerroelectricityOptical parametric amplifierchemistry.chemical_compoundOpticschemistryPeriodic polingLithium tantalatebusiness
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High-dimensional one-way quantum processing enabled by optical d-level cluster states

2019

By introducing and modifying two-photon hyper-entangled states in the time-frequency domain using an on-chip micro-cavity, we succeed in generating high-dimensional cluster states, demonstrate d-level measurement-based quantum processing and show the state’s higher noise tolerance.

PhysicsFour-wave mixingPhotonCluster (physics)State (functional analysis)TopologyQuantum information scienceInterference (wave propagation)Quantum computerDomain (software engineering)Quantum Information and Measurement (QIM) V: Quantum Technologies
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Graded Carrier Concentration Absorber Profile for High Efficiency CIGS Solar Cells

2015

We demonstrate an innovative CIGS-based solar cells model with a graded doping concentration absorber profile, capable of achieving high efficiency values. In detail, we start with an in-depth discussion concerning the parametrical study of conventional CIGS solar cells structures. We have used the wxAMPS software in order to numerically simulate cell electrical behaviour. By means of simulations, we have studied the variation of relevant physical and chemical parameters-characteristic of such devices-with changing energy gap and doping density of the absorber layer. Our results show that, in uniform CIGS cell, the efficiency, the open circuit voltage, and short circuit current heavily depe…

Materials scienceArticle SubjectBand gaplcsh:TJ807-830lcsh:Renewable energy sourceschemistry.chemical_elementSettore ING-IND/32 - Convertitori Macchine E Azionamenti ElettriciSettore ING-INF/01 - ElettronicaTHIN-FILMSOpticsGeneral Materials ScienceCU(INGA)SE-2Renewable Energy Sustainability and the Environmentbusiness.industryOpen-circuit voltageDopingSettore ING-INF/02 - Campi ElettromagneticiGeneral ChemistryCopper indium gallium selenide solar cellsAtomic and Molecular Physics and OpticschemistryLAYERMolybdenumOptoelectronicsbusinessPhotovoltaicShort circuitLayer (electronics)International Journal of Photoenergy
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Arbitrary Phase Access for Stable Fiber Interferometers

2021

Well-controlled yet practical systems that give access to interference effects are critical for established and new functionalities in ultrafast signal processing, quantum photonics, optical coherence characterization, etc. Optical fiber systems constitute a central platform for such technologies. However, harnessing optical interference in a versatile and stable manner remains technologically costly and challenging. Here, degrees of freedom native to optical fibers, i.e., polarization and frequency, are used to demonstrate an easily deployable technique for the retrieval and stabilization of the relative phase in fiber interferometric systems. The scheme gives access (without intricate dev…

Signal processingPhase (waves)Physics::Opticsquantum photonics01 natural sciencesDegrees of freedom (mechanics)Quantum entanglement010309 opticsOpticsinterferometers0103 physical sciencesAstronomical interferometerddc:530Optical fibersFiber interferometersFiber010306 general physicsOptical reference signalsPhysicsPhotonsUltrafast signal processingInterference effectsbusiness.industryOptical fiber systemsReference signalsSettore ING-INF/02 - Campi ElettromagneticiCondensed Matter PhysicsParticle beamsAtomic and Molecular Physics and OpticsElectronic Optical and Magnetic MaterialsSingle-photon detectorscoherent signal processingDewey Decimal Classification::500 | Naturwissenschaften::530 | Physikinterferometers coherent signal processing quantum photonicsbusinessInterferometric systemLaser & Photonics Reviews
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Second harmonic generation in coupled LiNbO3 waveguides by reverse-proton exchange

2003

We demonstrate second harmonic generation of a near-infrared pump in a nonlinearly coupled system formed by longitudinally uniform proton- and reverse-proton-exchanged LiNbO/sub 3/ planar waveguides. Phase- and mode-matched transverse electric (TE/sub 0/) frequency doubling into transverse magnetic higher order guided modes is achieved through temperature control, in agreement with the model.

Materials scienceTemperature controlProtonbusiness.industryPhase (waves)Second-harmonic generationPhysics::OpticsAtomic and Molecular Physics and OpticsElectronic Optical and Magnetic MaterialsTransverse planeTransverse magneticPlanarOpticsElectrical and Electronic EngineeringAtomic physicsbusinessNuclear Experiment
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Framework for complex quantum state generation and coherent control based on on-chip frequency combs

2018

Integrated frequency combs introduce a scalable framework for the generation and manipulation of complex quantum states (including multi-photon and high-dimensional states), using only standard silicon chip and fiber telecommunications components.

010302 applied physicsQuantum opticsPhysicsbusiness.industryFiber (mathematics)Electronic Optical and Magnetic MaterialPhysics::OpticsSettore ING-INF/02 - Campi ElettromagneticiQuantum information processingSettore ING-INF/01 - Elettronica01 natural sciences010309 opticsMechanics of MaterialsCoherent controlQuantum state0103 physical sciencesScalabilitySilicon chipOptoelectronicsCoherent statesbusinessFrontiers in Optics / Laser Science
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Wideband THz time domain spectroscopy based on optical rectification and electro-optic sampling

2013

We present an analytical model describing the full electromagnetic propagation in a THz time-domain spectroscopy (THz-TDS) system, from the THz pulses via Optical Rectification to the detection via Electro Optic-Sampling. While several investigations deal singularly with the many elements that constitute a THz-TDS, in our work we pay particular attention to the modelling of the time-frequency behaviour of all the stages which compose the experimental set-up. Therefore, our model considers the following main aspects: (i) pump beam focusing into the generation crystal; (ii) phase-matching inside both the generation and detection crystals; (iii) chromatic dispersion and absorption inside the c…

DiffractionTA1501Optical rectificationComputer scienceTerahertz radiationTerahertz radiationPhysics::OpticsSettore ING-INF/01 - ElettronicaArticleCrystalElectro-optic samplingOptical rectificationOpticsSampling (signal processing)Dispersion (optics)Thz time domain spectroscopyWidebandSpectroscopyAbsorption (electromagnetic radiation)Multidisciplinarybusiness.industrySettore ING-INF/02 - Campi ElettromagneticiQC0450Terahertz detectorsTerahertz sourcebusinessTelecommunicationsBeam (structure)
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CIGS PV Module Characteristic Curves Under Chemical Composition and Thickness Variations

2014

This paper analyzes how the electrical characteristics of a CIGS photovoltaic module are affected by the chemical composition and by the thickness variations of the CIGS absorber. The electrical characteristics here considered are the short circuit current, the open circuit voltage, the efficiency and the power peak. The chemical composition is varied by tuning the ratio between gallium and indium. This analysis has been performed by means of the wxAMPS software, developed by the University of Illinois. The above variations have been taken into account on a PV module made of 72 cells. This analysis has been carried out employing a PV module mathematical model developed and implemented by th…

EngineeringOpen-circuit voltagebusiness.industryPhotovoltaic systemchemistry.chemical_elementSettore ING-INF/02 - Campi ElettromagneticiSettore ING-IND/32 - Convertitori Macchine E Azionamenti ElettriciCopper indium gallium selenide solar cellsPhotovoltaic Modules characterizationSettore ING-INF/01 - ElettronicaPower (physics)CIGS Photovoltaic ModulechemistryElectronic engineeringOptoelectronicsGalliumbusinessMATLABShort circuitcomputerSettore ING-INF/07 - Misure Elettriche E ElettronicheIndiumcomputer.programming_language
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Universal N -Partite d -Level Pure-State Entanglement Witness Based on Realistic Measurement Settings

2019

Entanglement witnesses are operators that are crucial for confirming the generation of specific quantum systems, such as multipartite and high-dimensional states. For this reason, many witnesses have been theoretically derived which commonly focus on establishing tight bounds and exhibit mathematical compactness as well as symmetry properties similar to that of the quantum state. However, for increasingly complex quantum systems, established witnesses have lacked experimental achievability, as it has become progressively more challenging to design the corresponding experiments. Here, we present a universal approach to derive entanglement witnesses that are capable of detecting the presence …

MultipartiteQuantum cryptographyQuantum state0103 physical sciencesQuantum systemGeneral Physics and AstronomyQuantum entanglementStatistical physics010306 general physics01 natural sciencesQuantumEntanglement witnessQuantum computerPhysical Review Letters
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The role of nonlinear optical absorption in narrowband difference-frequency terahertz-wave generation

2010

We present a general analysis of the influence of nonlinear optical absorption on terahertz generation via optical difference frequency generation, when reaching for the quantum conversion efficiency limit. By casting the equations governing the process in a suitably normalized form, including either two-photon- or three-photon-absorption terms, we have been able to plot universal charts for phase matched optical-to-terahertz conversion for different values of the nonlinear absorption coefficients. We apply our analysis to some experiments reported to date, in order to understand to what extent multiphoton absorption could have played a role and also to predict the maximum achievable conver…

Physicsbusiness.industryTerahertz radiationEnergy conversion efficiencyFOS: Physical sciencesPhysics::OpticsNonlinear opticsStatistical and Nonlinear PhysicsTwo-photon absorptionAtomic and Molecular Physics and OpticsPhoton countingOptical rectificationOpticsNarrowbandOptical frequency conversion Optical materials Optical parametric amplifiers Optical phase matching Optical propagation in nonlinear media Optical pulse generation Optical waveguides Frequency conversion Semiconductor materials Semiconductor waveguidesbusinessAbsorption (electromagnetic radiation)Optics (physics.optics)Physics - OpticsJournal of the Optical Society of America B
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Surface Periodic Poling in Lithium Niobate and Lithium Tantalate

2005

Periodic Poling of Lithium Niobate crystals (PPLN) by means of electric field has revealed the best technique for finely tailoring PPLN structures and parameters, which play a central role in many current researches in the field of nonlinear integrated optics. Besides the most studied technique of bulk poling, recently a novel technique where domain inversion occurs just in a surface layer using photoresist or silica masks has been devised and studied. This surface periodic poling (SPP) approach is best suited when light is confined in a thin surface guiding layer or stripe, as in the case of optical waveguide devices. Also, we found that SPP respect to bulk poling offers two orders of magn…

Materials sciencebusiness.industryPolingLithium niobateHolographyFABRICATIONNonlinear opticsPhotoresistLINBO3law.inventionCRYSTALSchemistry.chemical_compoundSettore ING-IND/31 - ElettrotecnicaOpticschemistryLASERSlawPeriodic polingElectric fieldLithium tantalateEXCHANGED WAVE-GUIDESOptoelectronicsbusinessGENERATION
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Hyper-Entanglement in Time and Frequency

2019

Hyper-entanglement, i.e. entanglement in more than one degree of freedom, enables a multiplicative increase in Hilbert space size. Such systems can be treated as multi-partite even though the number of state particles is not increased, making them highly attractive for applications in high-capacity quantum communications and information processing [1]. Until now, such states have been realized only using combinations of fully independent degrees of freedom, described by commuting operators, such as polarization and optical paths. Time and frequency, in turn, are linked and described by non-commuting operators. Here, using two discrete forms of energy-time entanglement we demonstrate that ti…

Physicssymbols.namesakeFour-wave mixingUncertainty principlePhotonMultiplicative functionHilbert spacesymbolsDegrees of freedom (statistics)Quantum channelQuantum entanglementTopology2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)
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Optical d-level frequency-time-based cluster states

2019

Cluster states, a specific class of multi-partite entangled states, are of particular importance for quantum science, as such systems are equivalent to the realization of one-way (or measurement-based) quantum computers [1]. In this scheme, algorithms are implemented through high-fidelity measurements on the parties of the state [2]. While two-level (i.e. qubit) cluster states have been realized so far, increasing the number of particles to boost the computational resource comes at the price of significantly reduced coherence time and detection rates, as well as increased sensitivity to noise, restricting the realization of discrete cluster states to a record of eight qubits. In contrast, t…

Coherence timeComputer scienceQubitCluster (physics)Quantum information scienceTopologyRealization (systems)QuantumQuantum computerCoherence (physics)
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Comparison on the use of PV systems in the vertical walls

2015

In this article the preliminary evaluation of the performance of a photovoltaic window is presented. The aim is to trace the behavior of next-generation systems, which favor architectonical integration. Three different systems have been taken into account: a dye sensitized solar cell (DSSC), blue and grey caved silicon panels. The systems can be placed behind a window or behind a wall of glass blocks.

EngineeringArchitectural engineeringSiliconbusiness.industryPhotovoltaic systemWindow (computing)chemistry.chemical_elementPhotovoltaic mounting systemStructural engineeringSettore ING-IND/32 - Convertitori Macchine E Azionamenti ElettriciSettore ING-INF/01 - ElettronicaSettore ING-IND/31 - ElettrotecnicaDye-sensitized solar cellgreen energychemistryintegrated photovoltaicDSSCbusinessSettore ING-INF/07 - Misure Elettriche E Elettroniche2015 International Conference on Renewable Energy Research and Applications (ICRERA)
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Universal charts for optical difference frequency generation in the terahertz domain

2010

We present a universal and rigorous approach to study difference frequency generation in the terahertz domain, keeping the number of degrees of freedom to a minimum, through the definition of a suitable figure of merit. The proposed method relies on suitably normalized charts, that enable to predict the optical-to-terahertz conversion efficiency of any system based on wave propagation in quadratic nonlinear materials. The predictions of our approach are found to be in good agreement with the best experimental results reported to date, enabling also to estimate the d22 nonlinear coefficient of high quality GaSe.

Wave propagationComputer scienceTerahertz radiationDegrees of freedom (statistics)FOS: Physical sciencesFrequency conversionSettore ING-INF/01 - ElettronicaOptical pulse generationDomain (software engineering)Semiconductor materialsQuadratic equationQuality (physics)Submillimeter wave transmittersFigure of meritOptical parametric amplifiersElectrical and Electronic EngineeringOptical propagation in nonlinear mediaOptical frequency conversionSettore ING-INF/02 - Campi ElettromagneticiCondensed Matter PhysicsAtomic and Molecular Physics and Opticsoptical parametric amplifiersemiconductor materialNonlinear systemAlgorithmOptics (physics.optics)Physics - OpticsIEEE Journal of Quantum Electronics
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Complex quantum state generation and coherent control based on integrated frequency combs

2019

The investigation of integrated frequency comb sources characterized by equidistant spectral modes was initially driven by considerations towards classical applications, seeking a more practical and miniaturized way to generate stable broadband sources of light. Recently, in the context of scaling the complexity of optical quantum circuits, these on-chip approaches have provided a new framework to address the challenges associated with non-classical state generation and manipulation. For example, multi-photon and high-dimensional states were to date either inaccessible, lacked scalability, or were difficult to manipulate, requiring elaborate approaches. The emerging field of quantum frequen…

Quantum opticsPhotonbusiness.industryComputer sciencePhysics::OpticsNanophotonics Photonic integrated circuits Quantum entanglement Spontaneous emissionSettore ING-INF/02 - Campi Elettromagnetici02 engineering and technologyQuantum entanglementSettore ING-INF/01 - ElettronicaAtomic and Molecular Physics and OpticsFrequency combQC350020210 optoelectronics & photonicsCoherent controlQuantum state0202 electrical engineering electronic engineering information engineeringElectronic engineeringCoherent statesPhotonicsbusiness
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Parametrical study of multilayer structures for CIGS solar cells

2014

In this paper, a numerical analysis of relevant electrical parameters of multilayer structures for CIGS-based solar cells was carried out, employing the simulation software wxAMPS. In particular, we have focused on thin film cells having a ZnO:Al/ZnO/CdS/CIGS structure with a Molybdenum back contact. The aim of this work is to establish good theoretical reference values for an ongoing experimental activity, where our technology of choice is the single-step electrodeposition. In detail, we have analyzed how the main electrical properties change with the bang gap and the thickness of the absorber layer, for such a type of solar cell structure. Our results show that both efficiency and fill fa…

Materials scienceOrganic solar cellbusiness.industryBand gapSolar cellSettore ING-INF/02 - Campi ElettromagneticiHybrid solar cellCIGSQuantum dot solar cellSettore ING-IND/32 - Convertitori Macchine E Azionamenti ElettriciCopper indium gallium selenide solar cellsSettore ING-INF/01 - ElettronicaPolymer solar celllaw.inventionthin-filmlawSolar cellElectronic engineeringOptoelectronicsPlasmonic solar cellSettore CHIM/07 - Fondamenti Chimici Delle Tecnologiesingle-step electrodeposition.business
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Anomalous electrical parameters improvement in Ruthenium DSSC

2018

. In this work, we present a series of measurements carried out on Ruthenium-based Dye Sensitized Solar Cells (DSSCs) after the application of different external electrical field values. Such measurements have been performed both in the dark and by illuminating the sample with sunlight emitted by a solar simulator (AM1.5G spectrum with a power irradiance of 1000 W/m2). Our results demonstrate that the initial electrical bias field modifies in both cases the behavior of the cell in terms of an anomalous improvement of the main electrical parameters.

hysteresiMaterials scienceField (physics)Irradiancechemistry.chemical_element02 engineering and technologySettore ING-IND/32 - Convertitori Macchine E Azionamenti Elettrici01 natural sciencesSettore ING-INF/01 - Elettronica010309 optics020210 optoelectronics & photonics0103 physical sciences0202 electrical engineering electronic engineering information engineeringSunlightbusiness.industryRenewable Energy Sustainability and the EnvironmentBiasingperformance improvementRuthenium dyeDye Sensitized Solar Cells (DSSCs)RutheniumDye-sensitized solar cellHysteresischemistryAutomotive EngineeringOptoelectronicsSolar simulatorbusiness
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Experimental characterization of Ruthenium-based Dye Sensitized Solar Cells and study of light-soaking effect impact on performance

2016

In this paper, we present an experimental investigation on the performance of Ruthenium-based Dye Sensitized Solar Cells (DSSCs) at different irradiance levels, incident wavelengths and hours of illumination. In particular, the measurements have been aimed at studying the performance variation due to light soaking effect since this phenomenon has noteworthy practical implications, such as stability tests of DSSCs. Our results show that the short circuit current density, the open circuit voltage and the conversion efficiency η increase with the hours of light soaking. Finally, the observed phenomenon is reversible, and thus the performance decreases again when the cell is kept in the dark.

Laser Beam Induced Current (LBIC)Materials scienceIrradiancechemistry.chemical_element02 engineering and technology01 natural sciencesSettore ING-INF/01 - Elettronicaphotovoltaic0103 physical sciences010302 applied physicsDye Sensitized Solar cells (DSSCs)electro-optical characterizationbusiness.industryOpen-circuit voltageEnergy conversion efficiencySettore ING-INF/02 - Campi Elettromagneticilight soaking021001 nanoscience & nanotechnologyCharacterization (materials science)RutheniumWavelengthDye-sensitized solar cellchemistryOptoelectronics0210 nano-technologybusinessShort circuit
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Integrated generation of complex optical quantum states and their coherent control

2018

Complex optical quantum states based on entangled photons are essential for investigations of fundamental physics and are the heart of applications in quantum information science. Recently, integrated photonics has become a leading platform for the compact, cost-efficient, and stable generation and processing of optical quantum states. However, onchip sources are currently limited to basic two-dimensional (qubit) two-photon states, whereas scaling the state complexity requires access to states composed of several (<2) photons and/or exhibiting high photon dimensionality. Here we show that the use of integrated frequency combs (on-chip light sources with a broad spectrum of evenly-spaced fre…

Quantum opticsPhysicsPhotonbusiness.industry01 natural sciences010309 opticsCoherent controlQuantum stateQuantum mechanicsQubit0103 physical sciencesQuantum systemPhotonics010306 general physicsQuantum information sciencebusinessNanophotonics Australasia 2017
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Surface Periodic Domain Engineering in Congruent Lithium Tantalate Crystals

2006

First experiments with the novel electric field Surface Periodic Poling technique have been carried out on Lithium Tantalate. Optimal poling parameters gave 50:50 mark-to-space ratio in the micron scale with good uniformity and high repeatability.

Materials scienceferoolectricbusiness.industryLithium niobatePolingPhysics::OpticsSurface plasmon polaritonFerroelectricitychemistry.chemical_compoundOpticschemistryPeriodic polingElectric fieldLithium tantalateSurface roughnesslithium tantalateOptoelectronicspolingbusiness
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Fiber Interferometers for Time-domain Quantum Optics

2021

A novel method for stabilizing fiber interferometers based on frequency- and polarization-multiplexing enables unambiguous phase retrieval, long-term stability, and phase-independent performance. These capabilities allow for precise manipulation of time-bin quantum states in a low-complexity setup.

Quantum opticsPhysicsQuantum networkPhotonOpticsQuantum statebusiness.industryAstronomical interferometerTime domainQuantum key distributionPhase retrievalbusinessConference on Lasers and Electro-Optics
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Nanotechnology in lithium niobate for integrated optic frequency conversion in the UV

2017

In the domain of Earth Explorer satellites nanoengineered nonlinear crystals can optimize UV tunable solid-state laser converters. Lightweight sources can be based on Lithium Niobate (LN) domain engineering by electric field poling and guided wave interactions. In this Communication we report the preliminary experimental results and the very first demonstration of UltraViolet second-harmonic generation by first-order quasi-phase-matching in a surface-periodically-poled proton-exchanged LN waveguide. The pump source was a Ti-Sapphire laser with a tunability range of 700- 980 nm and a 40 GHz linewidth. We have measured UV continuous-wave light at 390 nm by means of a lock-in amplifier and of …

Materials sciencenanotechnologysecond harmonic generationbusiness.industrylithium niobateferroelectricsLithium niobateEnergy conversion efficiencySecond-harmonic generationPhotorefractive effectmedicine.disease_causeLaserlaw.inventionchemistry.chemical_compoundLaser linewidthOpticschemistrylawLithium tantalatemedicineOptoelectronicsbusinessUltravioletInternational Conference on Space Optics — ICSO 2006
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Scaling On-Chip Entangled Photon States to Higher Dimensions

2017

Considerable efforts have recently focused on advancing quantum information pro- cessing by increasing the number of qubits (the simplest unit of quantum information) in nonclassical systems such as ultracold atoms and superconducting circuits. A complementary approach to scale up infor- mation content is to move from two-level (qubit) to multilevel (quDit) systems.

Quantum Optics; Entangled LightQuantum OpticEntangled LightSettore ING-INF/02 - Campi ElettromagneticiSettore ING-INF/01 - Elettronica
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Guided-wave frequency doubling in surface periodically poled lithium niobate: competing effects

2007

We carried out second-harmonic generation in quasi-phase-matched ? -phase lithium niobate channel waveguides realized by proton exchange and surface periodic poling. Owing to a limited ferroelectric domain depth, we could observe the interplay between second-harmonic generation and self-phase modulation due to cascading and cubic effects, resulting in a nonlinear resonance shift. Data reduction allowed us to evaluate both the quadratic nonlinearity in the near infrared as well as the depth of the uninverted domains. © 2007 Optical

Nonlinear optics integrated opticsMaterials scienceGuided wave testingbusiness.industryLithium niobateNonlinear opticsSecond-harmonic generationPhysics::OpticsFOS: Physical sciencesStatistical and Nonlinear PhysicsHarmonic generation and mixingSettore ING-INF/01 - ElettronicaFerroelectricityAtomic and Molecular Physics and Opticschemistry.chemical_compoundOpticschemistryPeriodic polingNonlinear resonanceHigh harmonic generationbusinessPhysics - OpticsOptics (physics.optics)
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Bi-color spatial solitons in linearly uncoupled planar waveguides

2004

We report on the observation of spatial optical simultons in a novel geometry consisting of two partially overlapped, linearly uncoupled planar waveguides in lithium niobate obtained by reverse proton exchange. Two orthogonally polarized modes are coupled through an off-diagonal tensor element of the quadratic nonlinearity, giving rise to second harmonic generation and mutual trapping via cascading. This phenomenon demonstrates a balance between diffraction and self-focusing for two orthogonal modes of different waveguides, and occurs at room temperature in longitudinally uniform waveguides.

PhysicsDiffractionPhysics and Astronomy (miscellaneous)Protonbusiness.industryLithium niobatePhysics::OpticsSecond-harmonic generationNonlinear opticsTrappingMolecular physicsAtomic and Molecular Physics and Opticschemistry.chemical_compoundOpticsPlanarchemistryTensorbusiness
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On-chip entangled D-level photon states – scalable generation and coherent processing

2018

Exploiting a micro-cavity-based quantum frequency comb, we demonstrate the on-chip generation of high-dimensional entangled quantum states with a Hilbert-space dimensionality larger than 100, and introduce a coherent control approach relying on standard telecommunications components.

PhysicsPhotonElectronic Optical and Magnetic MaterialTheoryofComputation_GENERALPhysics::OpticsSettore ING-INF/02 - Campi Elettromagnetici02 engineering and technologyQuantum entanglementQuantum key distribution021001 nanoscience & nanotechnologyTopologySettore ING-INF/01 - Elettronica01 natural sciences010309 opticsFrequency combMechanics of MaterialsCoherent controlQuantum state0103 physical sciencesQuantum information0210 nano-technologyQuantumConference on Lasers and Electro-Optics
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Information Dynamics of Electric Field Intensity before and during the COVID-19 Pandemic.

2022

This work investigates the temporal statistical structure of time series of electric field (EF) intensity recorded with the aim of exploring the dynamical patterns associated with periods with different human activity in urban areas. The analyzed time series were obtained from a sensor of the EMF RATEL monitoring system installed in the campus area of the University of Novi Sad, Serbia. The sensor performs wideband cumulative EF intensity monitoring of all active commercial EF sources, thus including those linked to human utilization of wireless communication systems. Monitoring was performed continuously during the years 2019 and 2020, allowing us to investigate the effects on the patterns…

dynamical systems; electric field intensity; nonlinear dynamics; predictability; complexity; human mobilitySettore ING-INF/06 - Bioingegneria Elettronica E InformaticaGeneral Physics and Astronomycomplexity dynamical systems electric field intensity human mobility nonlinear dynamics predictabilityEntropy (Basel, Switzerland)
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Moderate-to-Strong Turbulence Generation in a Laboratory Indoor Free Space Optics Link and Error Mitigation via RaptorQ Codes

2016

Free Space Optics (FSO) is rapidly gaining interest as a line-of sight communication technology that offers capabilities similar - in terms of bandwidth and transfer rates - to optical fibre, also possessing several advantages compared with traditional radio frequency links. However, FSO link quality can be strongly affected by unfavourable weather conditions and also by the phenomenon of optical turbulence, even in clear sky. In this work, we have implemented an indoor FSO link and generated moderate-to-strong turbulence conditions along the optical path by using heaters and a mechanical ventilation system. In this way, we have been able to investigate the effects of the generated turbulen…

Physicsbusiness.industryNetwork packetFree Space Optics (FSO) indoor link turbulence generation packet loss rateless codes RaptorQ codesSettore ING-INF/03 - Telecomunicazioni05 social sciencesBandwidth (signal processing)050801 communication & media studies020206 networking & telecommunicationsSettore ING-INF/02 - Campi Elettromagnetici02 engineering and technologySettore ING-INF/01 - ElettronicaData recovery0508 media and communicationsOptical path0202 electrical engineering electronic engineering information engineeringBit error rateElectronic engineeringRadio frequencybusinessAdaptive opticsFree-space optical communication
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Scalable on-chip generation and coherent control of complex optical quantum states

2018

Integrated quantum frequency combs provide access to multi-photon and high-dimensional entangled states, and their control via standard telecommunications components, and can thus open paths for reaching the state complexities required for meaningful quantum information science.

PhotonComputer sciencebusiness.industryElectronic Optical and Magnetic MaterialTheoryofComputation_GENERALSettore ING-INF/02 - Campi ElettromagneticiQuantum channelSettore ING-INF/01 - ElettronicaMechanics of MaterialsQuantum stateCoherent controlElectronic engineeringQuantum informationPhotonicsQuantum information sciencebusinessQuantumConference on Lasers and Electro-Optics
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Anomalous performance enhancement effects in Ruthenium-based Dye Sensitized Solar Cells

2017

Dye Sensitized Solar Cells (DSSCs) are nowadays more and more employed since they present lower production costs than traditional silicon photovoltaic devices. An interesting phenomenon affecting such devices consists in the fact that current density-voltage (J-V) characteristic can depend on the history of the cell prior to the measurement, which often can be assimilated to an anomalous hysteresis effect. In this work, we study such phenomenon on Ruthenium-based DSSCs through a series of measurements performed after applying different values of external electrical field to the cell. The measurements have been carried out both under simulated sunlight (AM1.5G - 1000 W/m2) and in the dark. W…

hysteresiMaterials scienceField (physics)SiliconRenewable Energy Sustainability and the Environmentbusiness.industry020209 energyDye Sensitized Solar CellPhotovoltaic systemEnergy Engineering and Power Technologychemistry.chemical_elementSettore ING-INF/02 - Campi ElettromagneticiBiasinglight soaking02 engineering and technologySettore ING-INF/01 - ElettronicaTemperature measurementRutheniumphotovoltaicHysteresisDye-sensitized solar cellchemistry0202 electrical engineering electronic engineering information engineeringOptoelectronicsbusiness2017 6th International Conference on Clean Electrical Power (ICCEP)
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Terahertz time-domain spectroscopy based on photoconductive antennas

2016

In this work, we present our first experimental results obtained by means of a THz-TDS setup based on photoconductive antennas (PCAs). The main elements of the setup are: i) a mode-locked Ti:Sapphire femtosecond laser (Mai-Tai SP - Spectra Physics), providing optical pulses at 800±20 nm with a duration &lt; 50 fs and repetition rate of 84 MHz; ii) two photoconductive antennas, made in LT-GaAs (Low-Grown Temperature Gallium Arsenide), operating as THz emitter and detector; iii) an optical delay line.

Terahertz time-domain spectroscopySettore ING-INF/02 - Campi ElettromagneticiPhotoconductive antennasSettore ING-INF/01 - Elettronica
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Proton exchange channel waveguides compatible with surface domain engineering in Lithium Niobate crystals

2006

First experiments of proton exchange channel waveguides compatible with electric field surface periodic poling of congruent lithium niobate crystals are addressed. Picosecond nonlinear copropagating QPM-SHG measurements have been carried out on such structures.

Materials scienceProtonbusiness.industryLithium niobatePhysics::OpticsNonlinear opticsCondensed Matter::Materials Sciencechemistry.chemical_compoundchemistrySurface wavePeriodic polingElectric fieldPicosecondOptoelectronicsPhysics::Atomic PhysicsbusinessRefractive index2006 Conference on Lasers and Electro-Optics and 2006 Quantum Electronics and Laser Science Conference
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Surface periodic poling in congruent lithium tantalate

2006

The first demonstration of surface periodic poling of lithium tantalate at high voltages is reported. Periodic domain inversion with mark-to-space ratios close to the optimum 50:50 was successfully achieved down to micrometre periods with good uniformity and repeatability.

chemistry.chemical_compoundOpticsMaterials sciencechemistrybusiness.industryPeriodic polingOptical materialsLithium tantalateElectrical and Electronic EngineeringbusinessVoltageElectronics Letters
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Exploiting the optical quadratic nonlinearity of zinc-blende semiconductors for guided-wave terahertz generation: A material comparison

2010

We present a detailed analysis and comparison of dielectric waveguides made of CdTe, GaP, GaAs and InP for modal phase matched optical difference frequency generation (DFG) in the terahertz domain. From the form of the DFG equations, we derived the definition of a very general figure of merit (FOM). In turn, this FOM enabled us to compare different configurations, by taking into account linear and nonlinear susceptibility dispersion, terahertz absorption, and a rigorous evaluation of the waveguide modes properties. The most efficient waveguides found with this procedure are predicted to approach the quantum efficiency limit with input optical power in the order of kWs.

Semiconductor waveguidesTerahertz radiationPhase (waves)FOS: Physical sciencesPhysics::OpticsOptical powerFrequency conversionSettore ING-INF/01 - ElettronicaOptical pulse generationSemiconductor materialsDispersion (optics)Optical phase matchingFigure of meritOptical parametric amplifiersElectrical and Electronic EngineeringOptical propagation in nonlinear mediaPhysicsGuided wave testingbusiness.industryOptical frequency conversionCondensed Matter PhysicsAtomic and Molecular Physics and OpticsOptical waveguidesNonlinear systemOptical materialsTerahertz generationOptoelectronicsOptical frequency conversion Optical materials Optical parametric amplifiers Optical phase matching Optical propagation in nonlinear media Optical pulse generation Optical waveguides Frequency conversion Semiconductor materials Semiconductor waveguidesQuantum efficiencybusinessOptics (physics.optics)Physics - OpticsIEEE Journal of Quantum Electronics
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Electrical characterization of low power CIGSSe photovoltaic modules

2015

This paper presents the electrical characterization of low power CIGSSe photovoltaic (PV) modules. Such investigation is achieved to perform a comparison of their performances with conventional silicon PV modules. For this purpose, a test bench, suitable for the characterization of both traditional and innovative low power modules, has been set-up and experimental results are accurately described and discussed.

Settore ING-IND/31 - ElettrotecnicaTest benchSettore ING-IND/11 - Fisica Tecnica AmbientaleReliability (semiconductor)Computer sciencePower modulePhotovoltaic systemElectronic engineeringCIGSSe modules PV devices characterizationSettore ING-IND/32 - Convertitori Macchine E Azionamenti ElettriciSettore ING-INF/01 - ElettronicaCharacterization (materials science)Power (physics)2015 International Conference on Renewable Energy Research and Applications (ICRERA)
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Electro-optical characterization of ruthenium-based dye sensitized solar cells: A study of light soaking, ageing and temperature effects

2017

Abstract In this work, we report on the electro-optical characterization of Dye Sensitized Solar Cells (DSSCs) which use ruthenium complexes as sensitizers. In particular, several kinds of measurements have been performed to study the electrical performances and the efficiency levels of the cells at different operating conditions. In detail, the measurements have been conducted at varying temperatures and hours of light soaking. Our results show that the short circuit current density J SC , the open circuit voltage V OC and the conversion efficiency η increase with the hours of light soaking, while they decrease with temperature. A thorough investigation on the light soaking process at the …

Dye sensitized solar cells (DSSCs)FabricationMaterials sciencechemistry.chemical_element02 engineering and technology010402 general chemistry01 natural sciencesSettore ING-INF/01 - ElettronicaPhotovoltaicsElectrical and Electronic Engineeringbusiness.industryOpen-circuit voltageEnergy conversion efficiencySettore ING-INF/02 - Campi ElettromagneticiLight soaking021001 nanoscience & nanotechnologyElectro-optical characterizationsAtomic and Molecular Physics and Optics0104 chemical sciencesElectronic Optical and Magnetic MaterialsRutheniumCharacterization (materials science)Dye-sensitized solar cellchemistryOptoelectronics0210 nano-technologybusinessShort circuitPhotovoltaic
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Characterization of Thin Film Cig(S,Se)2 Submodules Using Solar Simulator and Laser Beam Induced Current Techniques

2015

In this work, the electrical and optical characterization of CIG(S,Se)2 sub-modules using both a solar simulator equipment and the Laser Beam Induced Current (LBIC) technique is presented. By using the solar simulator and a proper set-up, the electrical parameters of the modules at varying irradiance and temperatures are determined. In addition, the LBIC measurements are carried out to analyze the 2D photocurrent uniformity of the modules at two different wavelengths. Dispersion values of extracted parameters can be very useful for practically tuning the modelling stage at device/module level.

PhotocurrentWavelengthOpticsMaterials sciencebusiness.industryDispersion (optics)IrradianceOptoelectronicsSolar simulatorThin filmCurrent (fluid)businessCharacterization (materials science)2015 Fotonica AEIT Italian Conference on Photonics Technologies
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Proton exchanged waveguides in LiNbO&lt;inline-formula&gt;&lt;sub&gt;3&lt;/sub&gt;&lt;/inline-formula&gt; and LiTaO&lt;inline-formula&gt;&lt;sub&gt;3…

1998

Materials sciencebusiness.industryGeneral Engineeringchemistry.chemical_elementNonlinear opticsNonlinear crystalsConvertersLaserNeodymiumAtomic and Molecular Physics and Opticslaw.inventionNonlinear systemOpticschemistrylawbusinessOptical Engineering
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Thin Film CIGS Solar Cells, Photovoltaic Modules, and the Problems of Modeling

2013

Starting from the results regarding a nonvacuum technique to fabricate CIGS thin films for solar cells by means of single-step electrodeposition, we focus on the methodological problems of modeling at cell structure and photovoltaic module levels. As a matter of fact, electrodeposition is known as a practical alternative to costly vacuum-based technologies for semiconductor processing in the photovoltaic device sector, but it can lead to quite different structural and electrical properties. For this reason, a greater effort is required to ensure that the perspectives of the electrical engineer and the material scientist are given an opportunity for a closer comparison and a common language.…

photovoltaic moduleArticle SubjectComputer sciencelcsh:TJ807-830CIGS solar celllcsh:Renewable energy sourcessolar energyNanotechnologySettore ING-IND/32 - Convertitori Macchine E Azionamenti ElettriciSettore ING-INF/01 - ElettronicamodellingGeneral Materials ScienceThin filmThin-film solar cellRenewable Energy Sustainability and the Environmentbusiness.industryPhotovoltaic systemSettore ING-INF/02 - Campi ElettromagneticiGeneral ChemistrysimulationEngineering physicsCopper indium gallium selenide solar cellsAtomic and Molecular Physics and OpticsSemiconductorThin-film solar cells; CIGS solar cells; modelling; simulations; photonic structures; photovoltaic modules; solar energyCell structurephotonic structurebusiness
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On-chip quantum optical frequency comb sources

2018

Integrated optical frequency comb sources, based on nonlinear microring resonators, can be used to generate complex quantum states. In particular, we achieved multi-photon and high-dimensional entangled quantum states, as well as their coherent control.

Optical fiberAtomic and Molecular Physics and OpticPhysics::Optics02 engineering and technologyQuantum entanglement01 natural sciencesSettore ING-INF/01 - Elettronicalaw.invention010309 opticsFour-wave mixingQuantum statelaw0103 physical sciencesQuantum informationElectrical and Electronic EngineeringQuantumPhysicsbusiness.industryElectronic Optical and Magnetic MaterialSettore ING-INF/02 - Campi Elettromagnetici021001 nanoscience & nanotechnologyComputer Networks and CommunicationCoherent controlHardware and ArchitectureSignal ProcessingOptoelectronicsCoherent states0210 nano-technologybusiness
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Unambiguous phase retrieval in fiber-based interferometers

2020

A scheme for fiber interferometers, exploiting frequency-multiplexing in orthogonal fiber polarization modes, enables unambiguous phase retrieval. This allows for arbitrary phase tuning, providing a precise tool for time-bin qubit manipulation.

PhysicsOpticsFiber interferometers Frequency-multiplexing Phase retrieval Qubitbusiness.industryAstronomical interferometerSettore ING-INF/02 - Campi ElettromagneticiFiberbusinessPhase retrieval
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Designing time and frequency entanglement for generation of high-dimensional photon cluster states

2020

The development of quantum technologies for quantum information science demands the realization and precise control of complex (multipartite and high dimensional) entangled systems on practical and scalable platforms. Quantum frequency combs (QFCs) generated via spontaneous four-wave mixing in integrated microring resonators represent a powerful tool towards this goal. They enable the generation of complex photon states within a single spatial mode as well as their manipulation using standard fiber-based telecommunication components. Here, we review recent progress in the development of QFCs, with a focus on our results that highlight their importance for the realization of complex quantum …

PhotonComputer scienceQuantum photonicsSettore ING-INF/02 - Campi Elettromagnetici02 engineering and technologyQuantum entanglementFiber photonics021001 nanoscience & nanotechnology01 natural sciences010309 opticsQuantum technologyMultipartiteQuantum stateHigh-dimensional quantum states0103 physical sciencesElectronic engineeringIntegrated nonlinear optics0210 nano-technologyQuantum information scienceQuantumQuantum computer
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Photovoltaic module characteristics from CIGS solar cell modelling

2013

We describe our approach to the task of modelling, both at single cell structure and complete module levels, during the solar cell technology development process. This can give very helpful indications, in terms of global photovoltaic module characteristics, for the assessment of intermediate research results and planning of further experiments. We make reference specifically to the fabrication of thin film CIGS solar cells by means of single-step electrodeposition, a technique which appears fairly easy and low-cost but, at the same time, can lead to quite different structural and electrical properties.

Photonic structuresMaterials sciencebusiness.industryCIGS solar cellPhotovoltaic systemSettore ING-INF/02 - Campi ElettromagneticiHybrid solar cellSettore ING-IND/32 - Convertitori Macchine E Azionamenti ElettriciQuantum dot solar cellSettore ING-INF/01 - ElettronicaCopper indium gallium selenide solar cellsEngineering physicsModellingPolymer solar celllaw.inventionPhotovoltaic thermal hybrid solar collectorSolar energyPhotovoltaic modulelawSolar cellOptoelectronicsSolar simulatorThin-film solar cellbusinessSimulation2013 International Conference on Renewable Energy Research and Applications (ICRERA)
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Integrated Generation of High-dimensional Entangled Photon States and Their Coherent Control

2017

Exploiting a frequency-domain approach, we demonstrate the generation of high-dimensional entangled quantum states with a Hilbert-space dimensionality larger than 100 from an on-chip nonlinear microcavity, and introduce a coherent control platform using standard telecommunications components.

PhysicsPhotonParametric oscillators and amplifierPhysics::OpticsQuantum OpticSettore ING-INF/02 - Campi ElettromagneticiQuantum key distributionMode-locked lasersSettore ING-INF/01 - ElettronicaNonlinear systemNonlinear optics four-wave mixingQuantum stateCoherent controlIntegrated OpticQuantum mechanicsCoherent statesPhase modulationCurse of dimensionality
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Simulation analysis of Ruthenium-based Dye Sensitized Solar Cells

2016

Dye Sensitized Solar Cell (DSSC), usually referred as one of the most promising third generation photovoltaic devices, is an electrochemical device in which a molecule (i.e., the dye) chemisorbed onto the surface of a porous material absorbs the incident light and, thus, transfers an electron to the wide band gap semiconductor material. The injected electrons can diffuse through the semiconductor up to the collecting anode without the risk of recombination. The roles of the electrolyte which permeates the cell are to regenerate the ionized molecule and to implement a hole-transporting layer, allowing to repeat the abovementioned process. Thanks to this behaviour, semiconductors with large a…

photovoltaicDye Sensitized Solar Cell (DSSC)Settore ING-INF/02 - Campi Elettromagneticilight soakingSettore ING-INF/01 - Elettronica
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Employing Microwave Graphene Field Effect Transistors for Infrared Radiation Detection

2018

In this work, we investigate the possibility of employing graphene field effect transistors, specifically designed for microwave applications, as infrared detectors for telecom applications. Our devices have been fabricated on a sapphire substrate employing CVD-grown transferred graphene. The roles of both the gate dielectric and the DC bias conditions have been evaluated in order to maximize the infrared generated signal through an experimental investigation of the signal-to-noise ratio dependence on the transistor operating point.

lcsh:Applied optics. PhotonicsTechnologyMaterials scienceAtomic and Molecular Physics and OpticInfraredGate dielectricPhysics::Optics02 engineering and technologyDielectricgraphene field effect transistor01 natural sciencesSettore ING-INF/01 - Elettronicalaw.inventionCondensed Matter::Materials Scienceinfrared detectorslaw0103 physical sciencesmicrowave transistorlcsh:QC350-467Electrical and Electronic Engineering010306 general physicsGraphene; graphene field effect transistors; infrared detectors; microwave transistors; Atomic and Molecular Physics and Optics; Electrical and Electronic Engineeringbusiness.industryGraphenePhotoconductivityTransistormicrowave transistorslcsh:TA1501-1820021001 nanoscience & nanotechnologyAtomic and Molecular Physics and Opticsinfrared detector2018-020-021849 ALDOptoelectronicsGraphene0210 nano-technologybusinessddc:600Microwavegraphene field effect transistorslcsh:Optics. LightDC biasIEEE Photonics Journal
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Physiological parameters measurements in a cardiac cycle via a combo PPG-ECG system

2015

In this paper, we present an innovative way to measure some physiological parameters (such as the pre-ejection period, the pulse transit time, the blood pressure) in a cardiac cycle. A combo PPG-ECG system has been developed and employed to extract both the ECG signal from standard limb leads and simultaneously the photoplethysmography signal from the wrist and the forearm, to calculate the pre-ejection period. This system represents an easy and non-invasive technique to determine these biomedical parameters without using expensive impedance cardiography equipment.

silicon photo-multipliermedicine.diagnostic_testCardiac cycleComputer scienceblood pressurePulse Transit Timemean arterial pressure.SignalSettore ING-INF/01 - ElettronicaImpedance cardiographyBlood pressuremedicine.anatomical_structureForearmpulse transit timePhotoplethysmogrammedicinepre-ejection periodEcg signalBiomedical engineering
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Frequency doubling in surface periodically poled lithium niobate waveguides: Competing effects

2007

We fabricated α-phase pro ton-exchanged (PE) lithium niobate (LN) channel waveguides quasi phase-matched (QPM) via surface periodic poling (SPP) and carried out the first experimental demonstration of second harmonic generation (SHG) in such devices.[1] Experiments were performed by employing an optical parametric amplifier/oscillator producing 25 ps pulses in the range 1.1-1.6 μm with a line-width less than 2cm−1 and a repetition rate of 10Hz. SHG measurements were performed either at a fixed wavelength by varying the fundamental frequency (FF) input power or by scanning the FF wavelength, ratioing the second harmonic (SH) output to the FF input to obtain the conversion efficiency. By repe…

Surface (mathematics)Optical amplifierMaterials sciencebusiness.industryLithium niobateSecond-harmonic generationPhysics::OpticsWaveguide (optics)Power (physics)chemistry.chemical_compoundTransverse planeOpticschemistryPeriodic polingbusiness
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Opto-thermal dynamics of thin-film optical limiters based on the VO2 phase transition

2022

Protection of human eyes or sensitive detectors from high-intensity laser radiation is an important challenge in modern light technologies. Metasurfaces have proved to be valuable tools for such light control, but the actual possibility of merging multiple materials in the nanofabrication process hinders their application. Here we propose and numerically investigate the opto-thermal properties of plane multilayered structures with phase-change materials for optical limiters. Our structure relies on thin-film VO2 phase change material on top of a gold film and a sapphire substrate. We show how such a multi-layer structure can act as a self-activating device that exploits light-to-heat conver…

VO2photonicsoptical limitingSettore ING-INF/02 - Campi ElettromagneticiElectronic Optical and Magnetic Materials
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Laser Beam Induced Current measurements on Dye Sensitized Solar Cells and thin film CIG(S,SE)&lt;inf&gt;2&lt;/inf&gt; modules

2017

Calculating the efficiency of a solar cell depends on a precise knowledge of its area. Indeed, the photoresponse uniformity is essential to improve the manufacturing process. In this work we report on Laser Beam Induced Current measurements performed on CIG(S,Se) 2 modules and Dye Sensitized Solar Cells. These measurements, performed via a green and a red HeNe lasers both operating at an optical irradiance of 1 Sun, allowed to obtain an accurate photoresponse map of the specimens and highlighted the non-uniformities with a spatial resolution of 400 µm and 80 µm, respectively.

Materials sciencebusiness.industry020209 energyPhotoconductivityIrradiance02 engineering and technologyLaserlaw.inventionDye-sensitized solar cellOpticslawSolar cell0202 electrical engineering electronic engineering information engineeringOptoelectronicsThin filmOptical filterbusinessImage resolution2017 6th International Conference on Clean Electrical Power (ICCEP)
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On-chip quantum frequency combs for complex photon state generation (Conference Presentation)

2020

A key challenge in today’s quantum science is the realization of large-scale complex non-classical systems to enable e.g. ultra-secure communications, quantum-enhanced measurements, and computations faster than classical approaches. Optical frequency combs represent a powerful approach towards this, since they provide a very high number of temporal and frequency modes which can result in large-scale quantum systems. Here, we discuss the recent progress on the realization of integrated quantum frequency combs and reveal how their use in combination with on-chip and fiber-optic telecommunications components can enable quantum state control with new functionalities, yielding unprecedented capa…

PhotonQuantum stateComputer scienceComputationFrequency combs Quantum communications Quantum information Complex systems Control systems Four wave mixing ManufacturingElectronic engineeringKey (cryptography)Settore ING-INF/02 - Campi ElettromagneticiState (computer science)Quantum information scienceRealization (systems)QuantumLaser Resonators, Microresonators, and Beam Control XXII
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Nonstoichiometric silica mask to fabricate reverse proton-exchange waveguides in lithium niobate crystals

2004

Producing channel waveguides requires a photolithographic mask, but the standard technique of using thermally evaporated metal films for proton exchange has proved to be unsuitable for withstanding the rather aggressive process of reverse proton exchange. We report the fabrication of a nonstoichiometric silica mask by ion-plating plasma-assisted deposition. This mask is strong enough to resist both direct and reverse proton exchange and is also compatible with anisotropic dry etching for patterning the mask and with electric field poling. Our technique is a practical alternative to the use of SiO2 sputtered masks.

FabricationMaterials sciencebusiness.industryMaterials Science (miscellaneous)PolingLithium niobateIndustrial and Manufacturing Engineeringlaw.inventionchemistry.chemical_compoundOpticsResistchemistryEtching (microfabrication)lawOptoelectronicsDry etchingBusiness and International ManagementThin filmPhotolithographybusiness
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Practical system for the generation of pulsed quantum frequency combs

2017

The on-chip generation of large and complex optical quantum states will enable low-cost and accessible advances for quantum technologies, such as secure communications and quantum computation. Integrated frequency combs are on-chip light sources with a broad spectrum of evenly-spaced frequency modes, commonly generated by four-wave mixing in optically-excited nonlinear micro-cavities, whose recent use for quantum state generation has provided a solution for scalable and multi-mode quantum light sources. Pulsed quantum frequency combs are of particular interest, since they allow the generation of single-frequency-mode photons, required for scaling state complexity towards, e.g., multi-photon…

Quantum opticPhysics::Optics02 engineering and technologyPhotodetectionQuantum imagingIntegrated optics device01 natural sciencesSettore ING-INF/01 - Elettronica010309 opticsOpticsQuantum state0103 physical sciencesQuantum informationQCQuantum computerPhysicsQuantum opticsParametric oscillators and amplifierbusiness.industryQuantum sensorQSettore ING-INF/02 - Campi Elettromagnetici021001 nanoscience & nanotechnologyAtomic and Molecular Physics and OpticsQC0350Quantum technologyNonlinear optics four-wave mixingOptoelectronicsMode-locked lasers.0210 nano-technologybusiness
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Fabrication of graphene ruthenium-complex heterostructures

2015

The aim of this study is to understand the photoresponse of a Ruthenium-complex/graphene heterostructure. Early work demonstrated that light detection by graphene field effect devices was enhanced by dropcasting Ruthenium Complex molecules. Here we proposed to fabricate a new class of devices where the Ruthenium-complex molecules are embedded between two layer of CVD monolayer graphene.

heterostructuresgrapheneSettore ING-INF/02 - Campi ElettromagneticiSettore ING-INF/01 - Elettronica
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Sorgente laser multilinea NIR-RGB in guide ottiche RPE su Nd:LiNbO3

2004

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Photoelectric valuation of highly efficient Dye-Sensitized Solar Cells

2015

Nowadays, a growing demand for free and clean energy requires the study and the development of new low-cost solar photovoltaic (PV) cells. Among them, Dye Sensitized Solar Cells (DSSCs) based on ruthenium complexes as sensitizers are assuming a great importance. The DSSCs under study are composed placing in succession a transparent conductive glass on which is screen-printed a mesoporous TiO2 thin film sensitized by a ruthenium based dye (N719) , an electrolytic solution containing a redox couple (I-/I3-) and another conductive glass covered by a thin transparent catalyst platinum film. In this work, we have measured the main photoelectrochemical parameters of the above mentioned DSSCs at d…

solar cellphotovoltaicelectro-optical characterizationSettore ING-INF/02 - Campi ElettromagneticiDSSCSettore ING-INF/01 - Elettronica
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Ion Plating Plasma Assisted Deposition from Thermal Sources for Decorative Coatings

2008

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Z-Scan theory for thin film measurements: Validation of a model beyond the standard approach using ITO and HfO2

2023

The Z-Scan technique is an easy and widespread approach to evaluate the nonlinear optical coefficient of materials. However, the evaluation of the same coefficients for thin films requires complex experimental setups that allow to remove the contributions of the substrate. Here, we propose a simple, yet effective, theoretical approach that allows to include the substrate contribution to the focusing effect when scanning along the propagation axis. The proposed method therefore removes the need of complex experimental setups and paves the way for a simpler retrieval of optical properties of complex nanostructures.

Nonlinear opticsZ-ScanHafniaSettore ING-INF/02 - Campi ElettromagneticiITO
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Duplicazione di frequenza e tuning non lineare in guide d’onda in niobato di litio con poling periodico superficiale

2007

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Fabrication and Characterization of Dye-Sensitized Solar Cells

2014

Among the next-generation solar cells, a predominant role is played by Dye sensitized solar cells (DSSC) based on ruthenium complexes as sensitizers. They take advantage of a photoelectrochemical system to transform solar radiation into electric energy. In fact, DSSCs represent a cost-effective alternative to traditional silicon-based photovoltaic devices and they do not require expensive and sophisticated apparatus for their fabrication. In this work, we have produced and tested ruthenium DSSCs. In particular, we have measured the main parameters of these cells, such as the electrical and power performances and the efficiency levels, at different irradiance levels and at different incident…

solar cellFabricationthin filmCharacterizationSettore ING-INF/02 - Campi ElettromagneticiDSSCSettore CHIM/07 - Fondamenti Chimici Delle TecnologieSettore ING-INF/01 - Elettronica
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Analysis of Lithium Niobate Surface Layer after Electric Field Periodic Poling and Proton Exchange

2004

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Studio della Nonlinearità Quadratica di Zincoblende per la Generazione di TeraHertz in Guida d'Onda: un Confronto di Cristalli Differenti

2009

DFG TeraHertz generation can approach the quantum efficiency limit with much lower peak powers than bulk experiments. We give details on the model and on the waveguide geometry.

Semiconductor materialsOptical frequency conversionTerahertz generation
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Surface Plasmon Resonance Optical Biosensors for Mannoproteins Detection

2007

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Surface periodic poling in congruent lithium tantalate

2006

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Fabrication and electro-optical characterization of Ruthenium-based Dye-Sensitized Solar Cells

2015

In this paper, we measure the main photoelectrical parameters of Dye Sensitized Solar Cells (DSSCs) based on ruthenium complexes at different irradiance levels, incident wavelengths, temperatures and hours of light soaking

Laser Beam Induced Current (LBIC)Dye Sensitized Solar cells (DSSCs)electro-optical characterizationSettore ING-INF/02 - Campi ElettromagneticiPhotovoltaicSettore ING-INF/01 - Elettronica
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Studio della nonlinearità quadratica di zincoblende per la generazione di TeraHertz in guida d'onda: un confronto di cristalli differenti

2009

DFG TeraHertz generation can approach the quantum efficiency limit with much lower peak powers than bulk experiments. We give details on the model and on the waveguide geometry.

Semiconductor materialsOptical frequency conversionTerahertz generation
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CulnSe2/Zn(S,O,OH) junction on Mo foil by electrochemical and chemical route for photovoltaic applications

2014

Electrodeposition is a convenient technique for the development of low cost materials for photovoltaic (PV) device processing. Using a single step electrodeposition route, several groups have fabricated CIS (CuInSe) and CIGS (CuInGaSe) films [1]. One of the most important requirements for successful application of one-step electrodeposition film formation, is the ability to control composition of the deposited films and to develop polycrystalline microstructures with a low surface roughness and high sintered density. In this preliminary work, CIS films were produced by single bath electrodeposition finding the optimal conditions in order to achieve a dense film with high crystallinity and u…

photovoltaicSSettore ING-IND/23 - Chimica Fisica ApplicataElectrodepositionSolar CellSettore ING-INF/02 - Campi ElettromagneticiThin FilmCulnSe2Settore ING-INF/01 - ElettronicaMo foil
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Characterization of Ruthenium-based Dye-Sensitized solar cells

2015

In this paper, we measure the main photoelectrical parameters of Dye Sensitized Solar Cells (DSSCs) based on ruthenium complexes at different irradiance levels, incident wavelengths, temperatures and hours of light soaking.

solar cell dssc ruthenium solar cellsSettore ING-INF/02 - Campi ElettromagneticiSettore ING-INF/01 - Elettronica
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Non-uniform doping concentration CIGS absorber profile for highefficiency solar cells

2016

The quaternary chalcopyrite semiconductor alloy Cu(In,Ga)Se2 (CIGS) is nowadays commonly considered one of the most suitable materials to fabricate cost-effective and high-efficiency photovoltaic cells. Thanks to the optical and structural properties of the absorber layer and to the tunable bandgap, thin-film CIGS cells have reached efficiencies around 20%, not far from the maximum values of traditional crystalline silicon cells. This high efficiency, together with the conceivable low fabrication costs, makes CIGS cells a promising alternative to silicon technology for large-scale production. In order to further improve the cells performance, in a previous work we have already proposed a si…

Settore ING-INF/02 - Campi ElettromagneticiCIGS simulations solar cell photovoltaicsSettore ING-INF/01 - Elettronica
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Duplicazione di frequenza in guide d'onda in Niobato di Litio con poling periodico: ruolo dell'assorbimento multifotoni

2008

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MATCHING THIN LAYER FOR SURFACE PLASMON RESONANCE TUNING ON LITHIUM NIOBATE WAVEGUIDES

2006

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Polarization effects on the laser operation in RPE Nd3+:LiNbO3 channel waveguides

2005

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Analytical Model for wideband THz sources and detectors based on Optical Rectification and Electro-Optic Sampling

2013

An analytical model describing a laser based set-up for wideband THz generation and detection is presented. Particular attention is focused on the main broadband phenomena, which occur when THz radiations have to be handled.

Electro-optic samplingTerahertz sources Terahertz detectorsOptical rectificationTerahertz radiationSettore ING-INF/02 - Campi ElettromagneticiSettore ING-INF/01 - Elettronica
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University of Palermo: Exploiting the Optical Quadratic Nonlinearity of Zinc-Blende Semiconductors for Guided-Wave Terahertz Generation: A Material C…

2012

Content synopsis of the following paper: Matteo Cherchi, Alberto Taormina, Alessandro C. Busacca, Roberto L. Oliveri, Saverio Bivona, Alfonso C. Cino, Salvatore Stivala, Stefano Riva Sanseverino, and Claudio Leone, "Exploiting the Optical Quadratic Nonlinearity of Zinc-Blende Semiconductors for Guided-Wave Terahertz Generation: A Material Comparison", IEEE Journal of Quantum Electronics, Vol. 46, N. 3, March 2010

Optical waveguideOptical frequency conversionTerahertz generationSettore ING-INF/02 - Campi ElettromagneticiSettore ING-INF/01 - Elettronica
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Surface Plasmon Resonance Measurement of Neutravidin Layer on Gold Thin Film

2006

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Nano-domains definition in congruent lithium niobate by surface periodic electric-field poling

2005

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Cost Effective Treatments to Replace Galvanic Processes

2009

Some of the most severe problems in the replacement of galvanic treatment with PVD coatings reside, first of all, in the higher costs of vacuum processes and in the difficulty to coat many 3D small samples. This work describes the results obtained by using energetic deposition vacuum processes, of the family of Ion Plating Plasma Assisted (IPPA), using both thermal and sputtering sources, able to reduce dramatically the duration of deposition process and to eliminate the substrate heating and their pre-cleaning. Regarding the small 3D samples, an innovative structure, named "Ionic Rotarybarrel" is presented. The realised treatments are in the fields of decorative, protective and tribologica…

PVDThin film depositionIon plating plasma assisted
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Generazione di seconda armonica nel vicino infrarosso per quasi-accordo di fase in guide a scambio protonico in niobato di litio con polarizzazione p…

2006

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Electrochemical and chemical synthesis of CIS/Zn(S,O,OH) for thin film solar cells

2014

In this work, we are reporting results on the electrodeposition of the CuInSe2 thin films on molybdenum thin foil substrates. We have used an aqueous non-buffered electrolyte and a careful choice of deposition parameters to ensure a good quality and composition of the deposited films. In addition, CdS was replaced in the buffer layer with a wider bandgap Zn(S,O,OH) film obtained by chemical bath deposition. The deposited films were annealed in inert atmosphere at different temperatures. The influence of annealing temperature on the properties of the films is briefly discussed. Films were also characterized by photoelectrochemical and I-V measurements. Structural characterization was carried…

CuInSe2ElectrodepositionSolar CellThin FilmMo foil
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UV Generation in Surface Periodically Poled Lithium nimbate Proton Exchanged Optical Waveguides

2006

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Guide a scambio protonico in Tantalato di Litio stabili nel tempo

2008

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Analysis of Lithium Niobate Surface after Electric Field Periodic Poling and Proton Exchange

2004

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Confocal optical techniques to study channel waveguides in LiNbO3

2008

optical spectroscopy integrated optics
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Backward second-harmonic generation of near infrared picosecond pulses

2014

We report on backward second-harmonic generation using picosecond laser pulses in congruent lithium niobate with 3.2 µm periodic poling. By tuning both the pump wavelength and the sample temperature, we observed three resonant peaks in the range 1530-1730 nm, corresponding to 16th, 17th and 18th quasi-phase-matching orders, respectively. A maximum conversion efficiency of 0.475% was achieved at the 16th order with a 10 kW peak pump power. The latter is the highest conversion reported in bulk to date, for the backward configuration, with an improvement greater than 50% with respect to those previously achieved with nanosecond pulses for the same order of resonance.

Settore ING-INF/02 - Campi ElettromagneticiNonlinear Optics Parametric Processes Harmonic Generation and Mixing Picosecond PhenomenaSettore ING-INF/01 - Elettronica
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Generazione di seconda armonica per quasi accordo di fase in guide a canale su LiNbO3 periodicamente polato in superficie.

2005

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5th EOS Topical Meeting on Optical Microsystems, Poster OμS13_1569798553: Analytical Model for wideband THz sources and detectors based on Optical Re…

2013

Electro-optic samplingTerahertz detectorsOptical rectificationTerahertz radiationTerahertz sourceSettore ING-INF/02 - Campi ElettromagneticiSettore ING-INF/01 - Elettronica
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Ultraviolet quasi-phase-matched second harmonic generation in surface periodically poled Lithium Niobate optical waveguides

2006

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Modelling of Quasi-TM0,0 Laser Operation in RPE:Nd3+:LiNbO3 Channel Waveguides.

2007

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Characterization of thin film CIG(S,SE)2 submodules using solar simulator and laser beam induced current techniques (Versione estesa)

2015

In this work, the electrical and optical characterization of CIG(S, Se)2 sub-modules using both a solar simulator equipment and the Laser Beam Induced Current (LBIC) technique is presented. By using the solar simulator and a proper set-up, the electrical parameters of the modules at varying irradiance and temperatures are determined. In addition, the LBIC measurements are carried out to analyze the 2D photocurrent uniformity of the modules at two different wavelengths. Dispersion values of extracted parameters can be very useful for practically tuning the modelling stage at device/module level.

Laser Beam Induced Current (LBIC)Optical characterizationSubmoduleSettore ING-INF/02 - Campi ElettromagneticiSettore CHIM/07 - Fondamenti Chimici Delle TecnologieSemiconducting selenium compoundSolar simulatorSettore ING-INF/01 - ElettronicaElectrical parameter
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Nanotecnologie in Niobato di Litio per la conversione di frequenza in ottica integrata nel campo UV.

2007

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Terahertz Time-Domain Spectroscopy setup based on photoconductive antennas

2016

Despite the technical difficulties in developing efficient and compact sources and detectors for Terahertz (THz) radiation, this region of the electromagnetic spectrum is attracting an ever-increasing interest, due to its peculiar and high-potential applications in several fields, such as wideband communications, medicine, biology, non-destructive testing, security and defense. Within such contexts, the most widespread approach aiming to deal with THz pulses is based on the THz Time-Domain Spectroscopy (THz-TDS) system. In this work, we present our experimental results obtained by means of a THz-TDS set-up based on photoconductive antennas for both the generation and detection stage. It is …

Terahertz SpectroscopySettore ING-INF/02 - Campi ElettromagneticiSettore ING-INF/01 - ElettronicaPhotoconductive Antennas.
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Quasi Phase Matched UV Second Harmonic Generation in Lithium Tantalate soft PE Waveguides

2008

We report on first experimental results on UltraViolet second-harmonic generation by first-order quasiphase-matching in a surface periodically poled proton exchanged Lithium Tantalate waveguide. We have achieved a good compatibility with alpha phase proton exchanged channel waveguides in Lithium Tantalate. We held the sample in a temperature controlled oven kept at a constant temperature of 250 °C, to reduce photorefractive damage. The pump source was a Ti-Sapphire laser with a tunability range of 700 - 980 nm and a 40-GHz linewidth. Continuous wave UV light at 365.4 nm was produced with a conversion efficiency of 6.6% W-1cm-2.

second harmonic generationLithium Tantalatesurface periodic poling
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Una Via Elettrochimica per la Fabbricazione di Celle Solari a Semiconduttori Nanostrutturati

2009

Nella memoria si presentano i risultati preliminari su un processo di crescita elettrochimica di materiali nanostrutturati mediante l’impiego di stampi nanoporosi. Vengono quindi analizzate le possibili applicazioni del processo alla fabbricazione di semiconduttori nanostrutturati di interesse nel settore fotovoltaico, quali il CIGS, e le implicazioni dal punto di vista delle tecniche di caratterizzazione e di modellazione per dispositivi basati su tale tecnologia.

Deposizione ElettrochimicaCelle SolariSemiconduttori Nano-strutturatiCIGS
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Fabbricazione di guide PE in LiTaO3 prive di instabilità

2008

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Electro-optical characterization of highly efficient Dye-Sensitized solar cells

2015

Nowadays, a growing demand for free and clean energy requires the study and the development of new low-cost solar photovoltaic (PV) cells. Among them, Dye Sensitized Solar Cells (DSSCs) based on ruthenium complexes as sensitizers are assuming a great importance. The DSSCs under study are composed placing in succession a transparent conductive glass on which is screen-printed a mesoporous TiO2 thin film sensitized by a ruthenium based dye (N719), an electrolytic solution containing a redox couple (I-/I3-) and another conductive glass covered by a thin transparent catalyst platinum film. In this work, we have measured the main photoelectrochemical parameters of the above mentioned DSSCs at di…

photovoltaicelectro-optical characterizationSolar cellSettore ING-INF/02 - Campi ElettromagneticiDSSCSettore ING-INF/01 - Elettronica
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Role of nonlinear absorption during frequency doubling in lithium niobate waveguides.

2007

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Progettazione e realizzazione di biosensori a risonanza plasmonica superficiale in ottica integrata.

2007

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Generazione di luce UV per interazione QPM/SHG in guida ottica di niobato di litio congruente

2006

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Ingegnerizzazione dei domini ferroelettrici nel niobato di litio per applicazioni nonlineari

2005

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Nanotecnologie SPPLN con maschere in silica e fotoresist

2004

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CIGS THIN FILM BY ONE-STEP ELECTRODEPOSITION FOR SOLAR CELLS

2013

In this work, we present a cost-effective technique to produce CIGS thin films for solar cells by means of a single-step electrodeposition. In fact, electrodeposition is known as an easy technique for building low cost materials for photovoltaic device processing. Morphological, structural and optical characterization of these films has been performed.

Cu(InGa)Se2(CIGS)Settore ING-IND/23 - Chimica Fisica ApplicataOne-step electrodepositionCIGS solar cellThin-film solar cellSettore ING-INF/01 - Elettronica
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Photoresponse of graphene ruthenium-complex heterostructures

2015

The aim of this study is to understand the photoresponse of a Ruthenium-complex/graphene heterostructure. Early work demonstrated that light detection by graphene field effect devices was enhanced by dropcasting Ruthenium Complex molecules. Here we proposed to fabricate a new class of devices where the Ruthenium-complex molecules are embedded between two layer of CVD monolayer graphene.

ruthenium-complex heterostructuresSettore ING-INF/02 - Campi ElettromagneticiGraphenePhotodetectorSettore ING-INF/01 - Elettronica
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Prima dimostrazione di generazione UV per QPM in guide ottiche PE il LiTaO3

2008

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Light Soaking measurements on Ruthenium-based Dye Sensitized Solar Cells

2016

An interesting phenomenon occurring in Dye Sensitized Solar Cells (DSSCs) when exposed to an uninterrupted period of illumination is the so-called light soaking effect, which consists in the increase of the main electrical parameters of the cell, such as the photocurrent and the efficiency. Studying such an effect has noteworthy practical implications, ranging from the optimization of the manufacturing process to stability tests of DSSCs. In this paper, we present an experimental investigation on the performance variation, due to light soaking, of Ruthenium-based DSSCs.

solar cellphotovoltaicelectro-optical characterizationSettore ING-INF/02 - Campi ElettromagneticiDSSCSettore ING-INF/01 - Elettronica
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CIGS Thin Film by One-Step Electrodeposition Deposition for Solar Cells

2013

Settore ING-IND/23 - Chimica Fisica ApplicataPhotovoltaics thin filmSettore ING-INF/01 - Elettronica
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Frequency doubling in surface periodically-poled lithium niobate waveguides: role of cascading and nonlinear absorption

2008

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Nanotecnologie SPPLN per Dispositivi a Cristalli Fotonici

2004

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"Aux contraires": Simulazione della/nella Scienza

2009

Epistemologia
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Imaginary distance BPM as an efficient tool for modelling optical waveguide fabrication by ion diffusion

2006

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Poling periodico superficiale in tantalato di litio congruente

2006

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CuInSe2/Zn(S,O,OH) junction by electrochemical and chemical route for photovoltaic applications (GE 2014)

2014

Electrodeposition is a convenient technique for the development of low cost materials for photovoltaic (PV) device processing. Using a single step electrodeposition route, several groups have fabricated CIS (CuInSe) and CIGS (CuInGaSe) films. One of the most important requirements for successful application of one-step electrodeposition film formation is the ability to control composition of the deposited films and to develop polycrystalline microstructures with a low surface roughness and high sintered density.

solar cellphotovoltaicSettore ING-IND/23 - Chimica Fisica Applicatathin filmCIGSSettore ING-INF/01 - Elettronica
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SPEEDAM 2010 Poster REC0616: An electrochemical route towards the fabrication of nanostructured semiconductor solar cells

2010

Electrochemical DepositionCIGSNanostructured SemiconductorSolar Cells
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Prima sorgente nell’UV in ottica integrata ottenuta per QPM-SHG in Tantalato di Litio

2008

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Guide d’onda a scambio protonico in cristalli ferroelettrici con domini ingegnerizzati superficialmente

2006

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Fabrication and characterization of graphene field effect transistors (GFET)

2015

Graphene is a flat monolayer of carbon atoms tightly packed into a two-dimensional (2D) honeycomb lattice. This peculiarity is responsible of extraordinary physical properties. Graphene exhibits a strong ambipolar field effect and thanks to its huge charge carrier mobility, graphene is a suitable material for high frequency Electronics. Graphene field effect transistors (GFET) for high frequency applications have recently received much attention and significant progress has been achieved in this area. GFETs have been already made by using pre-patterned metal or graphene nanoribbon (GNR) back-gates and hexagonal boron nitride as a dielectric spacer. Among the most employed techniques for the…

Graphene FET field effect transistor
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Wideband THz time domain spectroscopy set-up based on ultrafast pulsed laser: model and experiments

2014

We present an analytical model describing the full electromagnetic propagation in a THz Time Domain Spectroscopy (THz-TDS) laser based system. We pay particular attention to the modelling of the time-frequency behavior of all the stages, which compose our experimental set-up. In particular, our model takes into account the following features: pump beam focusing into the generation crystal; phase-matching between pump and THz pulses inside both the generation and detection crystals; chromatic dispersion and absorption inside the materials; Fabry-Perot effect in both the crystals; diffraction along the propagation, focalization and overlapping between THz and probe beams; Electro-Optic Sampli…

Settore ING-INF/02 - Campi ElettromagneticiNonlinear Optics Terahertz Ultrafast PhotonicsSettore ING-INF/01 - Elettronica
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