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Linear and nonlinear optical changes in amorphous As2Se3 thin film upon uv exposure

Progress in Natural Science:Materials International 2011年第3期21卷 205-210页

作者： Rashmi CHAUHAN Amit Kumar SRIVASTAVA Arvind TRIPATHI Krishna Kant SRIVASTAVA Department of Physic DAV CollegeCSJM UniversityKanpur208001India Department of Physics DBS CollegeCSJM UniversityKanpur208006India Materials Science Programme 4. Research Foundation for Education and Technology 5. Department of Physics DBS CollegeCSJM University

Amorphous As2Se3chalcogenide thin film was exposed to uv light(i line and g line) using mercury lamp for 30 min. XRD,uv/VIS spectroscopy and thickness measurements were taken for unexposed and exposed thin film for structural and optical *** optical constants(linear refractive index,extinction coefficient and linear optical absorption coefficient) of the film were calculated from transmission spectra using Swanepoel *** bandgap was determined using Tauc’s relation of indirect bandgap *** of the material was described by single-oscillator Wemple-DeDiDomenico model. Nonlinear optical constants(χ~((3)) and n2) were determined from linear optical parameters using semi-empirical relations in long wavelength *** changes in linear optical parameters(increase in refractive index,and extinction coefficient;reduction in optical bandgap),nonlinear optical parameter(increase inχ~((3))) are proposed for various photonic applications.

关键词： amorphous chalcogenide thin films uv exposure optical properties swanepoel method Wemple-DeDiDomenico model semi-empirical relations

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Photo-induced optical changes in GexAs40Se60-x thin films

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Progress in Natural Science:Materials International 2010年第1期20卷 54-60页

作者： Rashmi CHAUHAN Amit Kumar SRIVASTAVA Arvind TRIPATHI Krishna Kant SRIVASTAVA Department of Physic DAV College Kanpur 208001India Material Science Programme ⅡT Kanpur 208016 India Epsilonium Systems Commercial Complex ChunniganjKanpur 208001India Department of Physics DBS College Kanpur 208006India

Ge-As-Se chalcogenide thin films show a wide range of photosensitivity,which is utilized for the fabrication of micro-optical elements for integrated *** photosensitivity of GexAs40Se60-x（x=0,15）chalcogenide thin films for uv light was *** that purpose,the bulk samples of GexAs40Se60-x（x=0,15）chalcogenide glasses were prepared using conventional melt quenching technique,and thin films were prepared using thermal evaporation *** thin films were exposed to uv light for two *** natures of bulk samples and thin films were verified by XRD and chemical compositions were verified by EDX *** thicknesses of the thin films were measured using a thickness *** optical analysis of these thin films was done using transmission spectra in wavelength range of 300-900 *** bandgap was determined by first peak of transmission derivative as well as extrapolation of Tauc's plot.R2analysis was done using R software to ensure that the material is indirect bandgap *** is observed that two hours uv exposure causes photo-darkening along with photo-expansion in As40Se60thin films,while photo-bleaching and photo-densification for Ge15As40Se45thin ***,the amounts of photo-induced optical changes for Ge15As40Se45thin films are smaller than those for As40Se60thin *** changes in optical absorption,bandgap and thickness are understood based on the bonding rearrangement caused by uv exposure.

关键词： chalcogenide glasses thin films optical properties photo-induced effect optical band gap uv exposure R software

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EFFECT OF COMPOSITION AND PROCESSING CONDITION ON MICROSTRUCTURAL PROPERTIES AND DURABILITY OF FLUOROPOLYMER/ACRYLIC BLENDS

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Chinese Journal of Polymer Science 2009年第1期27卷 59-69页

作者： Derek L.Ho Forrest.A.Landis Diep Nguyen National Institute of Standards and Technology (NIST) GaithersburgMDUSA Pennsylvania State University YorkPAUSA Illinois Institute of Technology ChicagoILUSA

Fluoropolymer blends have been widely used as binders for exterior coatings because of their excellent resistance to ultra-violet (uv) radiation as well as to many corrosive chemical *** is known that the fluorinated component usually has a lower glass transition temperature and easily crystallizes in the final structure depending upon the blend composition and sample annealing *** investigated the effect of blend composition and annealing process (slow and fast cooling) on the surface morpho...

关键词： AFM Confocal microscopy Crystallinity Surface morphology Small angle scattering uv exposure

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