Optical properties of (GeSe2)100−(Sb2Se3) glasses in near- and middle-infrared spectral regions

Abstract

International audienceChalcogenide glasses from Ge-Sb-Se ternary system with different antimony content were fabricated and basic physico-chemical properties (chemical composition, thermal characteristics, density) were evaluated considering the glassy network connectivity. Optical properties of the glasses were heavily studied employing transmission spectroscopy, prism coupling technique, and particularly spectroscopic ellipsometry covering broad spectral range (0.3-20 μm). Refractive indices data show very good agreement between ellipsometry and prism coupling techniques in near-infrared range. Moreover, the reliability of infrared spectroscopic ellipsometry was demonstrated for precise determination of refractive index of chalcogenide glasses in near- as well as middle-infrared spectral regions

Accurate Determination of Optical Functions of Ge–As–Te Glasses via Spectroscopic Ellipsometry

“…22 Pretty good agreement between refractive indices data (for As 2 Se 3 glass, maximum Dn = 0.004 at 3390 nm) extracted from spectroscopic ellipsometry and results of prism coupling technique, which is considered as the most precise for the refractive index measurement, thus revealed applicability of spectroscopic ellipsometry for precise determination of refractive index of chalcogenide glasses. 22 For correct VASE data treatment, we selected strategy consisting of Cody-Lorentz model application for the description of UV-Vis-NIR ellipsometry data (transformed into real and imaginary parts of pseudodielectric function), followed by implementation of empirical Sellmeier equation for refractive index in MIR region. Total number of parameters used for the fitting procedure using Cody-Lorentz model was eight (three of them describing Lorentz oscillator, 4 to characterize variable band edge function-one of them being optical band gap, and one parameter to describe surface roughness of the glass by effective medium approximation).…”

Amorphous Ge‐Sb‐Se thin films fabricated by co‐sputtering: Properties and photosensitivity

“…1 Covalent glasses of ternary Ge-As-Se and Ge-Sb-Se systems have been recently widely studied due to a large glass-forming region and good mechanical and physical properties when compared with classical binary chalcogenides. Although the Ge-As-Se system is particularly attractive due to its greater glass-forming region compared to Ge-Sb-Se system, the introduction of antimony provides higher polarizability increasing (non)linear refractive index and reduction in photosensitivity, 6 representing an interesting option for nonlinear optics. [7][8][9] Last but not least, improved shaping ability of Ge-Sb-Se glasses allows fabrication of fibers or thin films, which are of high importance considering optical sensor development, for instance.…”

Laser Desorption Ionisation Time‐of‐Flight Mass Spectrometry of Chalcogenide Glasses from (GeSe2)100−x(Sb2Se3)x System

“…On the other hand, glass transition temperature and band gap energy decrease with introduction of Sb 2 Se 3 . Photosensitivity of (GeSe 2 ) 100− x (Sb 2 Se 3 ) x glasses, attributed to two photon absorption, seems to be strongly reduced for glasses with intermediate Sb 2 Se 3 content (at x = 30–40) …”

“…Partial substitution of Ge with Sb may result in an increase in the (non)linear refractive index of the corresponding amorphous chalcogenides due to the enlargement of (hyper)polarisability. The other effect of antimony presence is the lowering the optical band gap . Finally, presence of antimony in amorphous chalcogenides is known to reduce photosensitivity of both, the bulk glasses and thin films .…”

“…The other effect of antimony presence is the lowering the optical band gap. 13 Finally, presence of antimony in amorphous chalcogenides is known to reduce photosensitivity of both, the bulk glasses and thin films. 4,14 We note that since both, germanium and antimony are aliovalent ions, the local structure of Ge-Sb-Se glasses/amorphous thin films changes drastically with introduction of antimony.…”