Speaker
Description
Structural studies of As-S-Se glasses
Kochubei H.$^{1}$, Stronski A.$^{1}$, Kostyukevich S.$^{1}$, Balayeva N.$^{2}$, Popovych M. $^{1}$, Dzhagan V.$^{1}$, Zahn D.R.T.$^{2}$
$^{1}$ V.Lashkaryov Institute of Semiconductor Physics NAS Ukraine, Kyiv, Ukraine
$^{2}$ Semiconductor Physics and MAIN, Chemnitz University of Technology, Chemnitz, Germany
kochubei.hanna@gmail.com
The mid-IR photonics sector uses chalcogenide As-S-Se glasses extensively. These glasses are used in a variety of applications, including optical fibres for power delivery and supercontinuum generation, as well as sensing and spectroscopy. They can be used as inorganic photoresists, holography media, in fabrication of optical elements such as axicons and Fresnel zone plates.
In this work, three compositions of the As-S-Se system - As$_{32.39}$S$_{62.70}$Se$_{4.91}$, As$_{41.24}$S$_{27.11}$Se$_{31.65}$, and As$_{43.29}$S$_{26.15}$Se$_{30.56}$ - were investigated using X-ray diffraction. The measurements were performed with a Rigaku SmartLab diffractometer in parallel-beam geometry employing Cu Kα radiation (λ = 1.5406 Å) within the 2θ range of 2-120° and a step size of 0.05° at room temperature. The radial distribution functions (RDFs) were calculated using RAD GTK+, yielding first-neighbour distances r$_{1}$ ranging from 2.29 to 2.40 Å, which fit well within the values typically reported for chalcogenide As-S/Se networks.
Complementary Raman spectroscopy measurements were carried out using a LabRAM HR spectrometer (HORIBA Scientific) in backscattering geometry at room temperature. The spectra were excited with a 514.7 nm laser (110 μW) focused through a 50x objective, covering the 50-1500 cm$^{-1}$ spectral range with 1 cm$^{-1}$ resolution and an integration time of 120s. The obtained vibrational bands are consistent with those reported in the literature for As-S-Se glasses, confirming the presence of mixed AsS$_{3/2}$ and AsSe$_{3/2}$ pyramidal units.
| Type of presence | Presence at Taras Shevchenko National University |
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