Search results for "campi elettromagnetici"

showing 10 items of 155 documents

Universal N-partite d-level pure-state entanglement witness based on realistic measurement settings

2018

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 …

Entanglement detection Entanglement measures Quantum entanglement Quantum measurementsSettore ING-INF/02 - Campi ElettromagneticiSettore ING-INF/01 - ElettronicaQC
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Opals infiltrated with a stimuli-responsive hydrogel for ethanol vapor sensing

2013

We report on a novel class of optical materials for ethanol vapor sensing, based on polystyrene opals infiltrated with an innovative stimuli responsive hydrogel. We describe the fabrication process of the bare polystyrene opals and their subsequent infiltration. The optical characterization of the photonic crystal templates was performed to prove the good quality of the samples. Measurements on the infiltrated opals showed that the transmission spectra in the visible range strongly change at varying concentrations of ethanol vapor. The fabricated structures show a linear optical response in the visible range, for high values of ethanol concentration.

EthanolMaterials scienceFabricationNanostructure fabrication.technology industry and agricultureSettore ING-INF/02 - Campi ElettromagneticiNanotechnologySettore ING-INF/01 - ElettronicaElectronic Optical and Magnetic MaterialsOPALS (Ogren Plant Allergy Scale)Optical sensing and sensorchemistry.chemical_compoundchemistryChemical engineeringOptical materialsPhotonic crystalSettore CHIM/07 - Fondamenti Chimici Delle Tecnologiesense organsPolystyreneRefractive indexPhotonic crystalVisible spectrumOptical Materials Express
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Fabrication of Graphene Field Effect Transistors (GFET) possessing a photoelectrical response

2014

Graphene TransistorGraphene TechnologySettore ING-INF/02 - Campi ElettromagneticiSettore ING-INF/01 - Elettronica
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Harmonic generation in all-dielectric metasurfaces

2023

Nonlinear light generation is a key phenomenon in many optical systems. Recently, the field of nonlinear optics has moved to the miniaturization of conventional bulky components. Among all the new platforms that have been proposed, dielectric nanoscale resonators represent excellent candidates for light generation and manipulation. When arranged in periodic arrays, such high refractive index scattering components become an artificial material called metasurface. Several approaches for designing platforms with enhanced optical nonlinearities at moderate pump intensities have been proposed. In this chapter, we review the most recent results on second- and third-order nonlinear processes in hi…

Harmonic generationNonlinear opticSettore ING-INF/02 - Campi ElettromagneticiCircular dichroismDielectric metasurfaceBound state in the continuum
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Homodyne Solid-State Biased Coherent Detection of Ultra-Broadband Terahertz Pulses with Static Electric Fields.

2021

We present an innovative implementation of the solid-state-biased coherent detection (SSBCD) technique, which we have recently introduced for the reconstruction of both amplitude and phase of ultra-broadband terahertz pulses. In our previous works, the SSBCD method has been operated via a heterodyne scheme, which involves demanding square-wave voltage amplifiers, phase-locked to the THz pulse train, as well as an electronic circuit for the demodulation of the readout signal. Here, we demonstrate that the SSBCD technique can be operated via a very simple homodyne scheme, exploiting plain static bias voltages. We show that the homodyne SSBCD signal turns into a bipolar transient when the stat…

HeterodyneFour-wave mixing Solid-state device THz pulse detectionTerahertz radiationTHz pulse detectionGeneral Chemical Engineering02 engineering and technology01 natural sciencesSignalSettore ING-INF/01 - ElettronicaArticlelcsh:Chemistry010309 opticsOptics0103 physical sciencesDemodulationGeneral Materials Sciencesolid-state deviceElectronic circuitPhysicsbusiness.industryAmplifierSettore ING-INF/02 - Campi Elettromagnetici021001 nanoscience & nanotechnologyDirect-conversion receiverlcsh:QD1-999four-wave mixing0210 nano-technologybusinessVoltageNanomaterials (Basel, Switzerland)
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New Cost Effective Titanium Based Protective and Decorative Coatings by Ion Plating Plasma Assisted IPPA

2009

The activity aiming to replace galvanic treatments by vacuum processes is based on the effort to reduce the production costs and to set-up new decorative effects impossible to be galvanically realised because the use of dielectric materials. This work describes cost effective metal-oxide and oxide-metal-oxide decorative coatings based on the use of titanium as basic material deposited by Ion Plating Plasma Assisted from Reactive Magnetron Sputtering source. A new multilayer protective and decorative structure, based on the use of titanium and titanium oxides is also presented. The protective effect against aggressive environment is obtained by alternating layers of metal and metal-oxide mix…

IPPAIon Plating Plasma AssistedSettore ING-INF/02 - Campi ElettromagneticiThin film depositionProtective and Decorative Coating
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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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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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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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Characterization of Thin Film CIG(S,Se)2 submodules using Laser Beam Induced Current Technique

2015

Nowadays, an important class of thin film solar cells consists of CuInGa(S,Se)2 (CIGSSe) solar cells, i.e., composed of Copper, Indium, Gallium, Sulfur and Selenide. Thanks to their electrical and optical properties and to the technological development, thin film integrated photovoltaic modules have nowadays obtained relatively good values of efficiency. In this work, we have performed the electrical and optical characterization of a CIGSSe sub-module by using both a solar simulator equipment and the Laser Beam Induced Current (LBIC) technique.

Laser Beam Induced Current (LBIC)electro-optical characterizationthin filmCIGS solar cellSettore ING-INF/02 - Campi ElettromagneticiSettore CHIM/07 - Fondamenti Chimici Delle TecnologieSettore ING-INF/01 - Elettronica
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