0000000000385153

AUTHOR

Alessandro Chiasera

showing 3 related works from this author

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
researchProduct

Acoustic dynamics of network-forming glasses at mesoscopic wavelengths

2013

The lack of long-range structural order in amorphous solids induces well known thermodynamic anomalies, which are the manifestation of distinct peculiarities in the vibrational spectrum. Although the impact of such anomalies vanishes in the long wavelength, elastic continuum limit, it dominates at length scales comparable to interatomic distances, implying an intermediate transition regime still poorly understood. Here we report a study of such mesoscopic domains by means of a broadband version of picosecond photo-acoustics, developed to coherently generate and detect hypersonic sound waves in the sub-THz region with unprecedented sampling efficiency. We identify a temperature-dependent fra…

Physics::OpticsGeneral Physics and Astronomy02 engineering and technologyBioinformatics01 natural sciencesArticleGeneral Biochemistry Genetics and Molecular BiologyOpticsFractal0103 physical sciencesBroadband010306 general physicsPhysicsMesoscopic physicsMultidisciplinarybusiness.industryAttenuationDynamics (mechanics)General Chemistry021001 nanoscience & nanotechnologyMaterials sciencePhysical sciencesWavelengthPicosecond0210 nano-technologybusiness
researchProduct

Synthesis, structure and spectroscopic properties of luminescent GdVO 4 :Dy 3+ and DyVO 4 particles

2018

Part of this research was done during visit of D.J. to IFN-CNR CSMFO Lab. and FBK Photonics Unit, Povo-Trento, Italy, in the framework of the STSM (Grant No. 38223) from the project: COST Action MP 1401 Advanced Fibre Laser and Coherent Source as tools for Society, Manufacturing and Lifescience” (2014e2018). The authors from Vinca Institute of Nuclear Sciences acknowledge the financial support of the Ministry of Education, Science and Tech-nological Development of the Republic of Serbia (Project No: 45020 and 172056). L.T.N. Tran acknowledges the scholarship of the Ministry of Education and Training, Vietnam International Education Development. T. G. acknowledges the ERDF PostDoc project No…

Materials sciencePhotoluminescenceLuminescenceAnalytical chemistryNanoparticle02 engineering and technology010402 general chemistry01 natural sciencesDysprosium vanadateInorganic Chemistrysymbols.namesakeTetragonal crystal system:NATURAL SCIENCES:Physics [Research Subject Categories]Near-infrared regionElectrical and Electronic EngineeringPhysical and Theoretical ChemistrySpectroscopyDysprosium doped gadolinium vanadateSpectroscopyIonic radiusDopantOrganic Chemistry021001 nanoscience & nanotechnologyAtomic and Molecular Physics and Optics0104 chemical sciencesElectronic Optical and Magnetic MaterialsTransmission electron microscopyRaman spectroscopysymbols0210 nano-technologyRaman spectroscopyOptical Materials
researchProduct