Ultrabroadband terahertz spectroscopy of chalcogenide glasses

Maksim Zalkovskij, Christer Zoffmann Bisgaard, Andrey Novitsky, Radu Malureanu, Dan Savastru, Aurelian Popescu, Peter Uhd Jepsen, Andrei Lavrinenko

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    Abstract

    Chalcogenide glasses are receiving a lot of attention due to their unique optical properties. In this paper we study the optical properties of As2S3 and GaLaS glasses in a broad terahertz (THz) frequency range (0.2-18 THz). Complex dispersion behavior with drastic changes of refractive index and absorption coefficient is found for both glasses. We observe the breakdown of the universal power-law dependence of the absorption coefficient due to atomic vibrations observed at low THz frequencies in disordered materials, and see the transition to localized vibrational dynamics for the As2S3 compound at higher frequencies. In addition, As2S3 displays two transparency regions, at 7-8 THz and 12.2 THz, of potential interest for future nonlinear applications in the THz range.
    Original languageEnglish
    JournalApplied Physics Letters
    Volume100
    Issue number3
    Pages (from-to)031901
    ISSN0003-6951
    DOIs
    Publication statusPublished - 2012

    Bibliographical note

    Copyright (2012) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Applied Physics Letters / Volume 100 / Issue 3 and may be found at http://apl.aip.org/resource/1/applab/v100/i3/p031901_s1.

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