An curve-fitting method for accurate determination of optical constants and thickness is presented for chalcogenide glasses thin films. Optical constants and thickness of nanomultilayer chalcogenide structure As2S3:Mn-Se were obtained by Swanepoel method from transmission spectrum using PARAV software. Proposed curve-fitting method is based on numerical simulation of transmission spectrum based on film parameters obtained by Swanepoel method and comparison one with experimental transmission spectrum. It is shown that modeled spectrum is not fully corresponding to the original measured spectrum due to inaccurate absorption coefficient determination in the region of Urbach absorption. Adjusting of absorption spectrum with further numerical simulation of spectrum allows achieving the best correspondence to original transmission spectrum. It solves the problem of the accurate absorption coefficient calculation in the different absorption regions. Finally, dependencies of the absorption coefficient on wavelength of the nanomultilayer chalcogenide films structures were obtained from transmission spectra using the proposed method.
Chalcogenide glasses As2S3 doped with ytterbium were investigated by Raman spectroscopy in order study the structural
changes accompanying the incorporation of impurity metal ions in the host glass structure. Doping of As2S3 glasses with
small amount of Yb ions, up to 1 % wt., only slightly affect the short-range order structure of the host matrix. For Yb
concentration more than 1 % wt. the sharp increase of presence of the additional bands characteristic for the vibrations
non-stoichiometric molecular fragments which contain homopolar S-S and As-As bonds was observed. Such changes
correlate with data on the thermal properties of such glasses where Tg values were sharply decreased if Yb concentration
was more than 1 % wt. No additional bands besides characteristic for As2S3 stoichiometric and non-stoichiometric
structural units were found. The main observed effect under the introduction of ytterbium into As2S3 is the change of
relative concentration of the main and non-stoichiometric structural units characteristic for As2S3 glasses.
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