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

• Bulk (GeSe2)100−x(Sb2Se3)x glasses (x = 5–60) were synthesized in high purity.
• Refractive index is strongly rising with increasing antimony content in the glasses.
• Prism coupling method refractive indices data agree with spectroscopic ellipsometry.
• Reliability of middle-infrared ellipsometry is demonstrated for chalcogenide glasses.

Chalcogenide 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.

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