MICROSTRUCTURE AND OPTICAL PROPERTIES OF As-2(SxSe1-x)(3) GLASSES IN VIS-NIR REGION

As-2(SxSe1-x)(3) glasses were prepared by the traditional melt-quenching method with As, S and Se of 99.999% purity. We kept the ratio of As/(S+Se) and change the ratio of S/Se in the studied glass series in order to study the influence of the replacement of chalcogen elements on the microstructure and the optical band gap. The compositional evolution of the main Raman scattering frequency of As-2(SxSe1-x)(3) bulk glasses was analyzed to investigate the structural changes following the replacement of Se for S. Based on visible-near infrared transmission spectra, We found that the higher temperature or more Se contents shift the optical absorption edge of the glasses to lower photon energies. Compositional dependences of the optical properties are qualitatively analyzed from electronic structural and elementary compositional points of view.