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Optics and Spectroscopy, 2023 Volume 131, Issue 11, Pages 1522–1525 (Mi os1524)

International Conference Physics.SPb/2023 October 23-27, 2023, St. Petersburg
Ultraviolet, infrared, and terahertz optics

Temperature dispersions of refractive indices and absorption coefficients of mercury thiogallate crystals in the terahertz frequency range

E. V. Stroganova, D. V. Badikov, G. S. Shevyrdyaeva, V. V. Galutskiy

Kuban State University, Krasnodar, Russia

Abstract: THz absorption and refraction spectra of HgGa$_2$S$_4$ crystals of various compositions in the temperature range of 300–400 K have been studied, and a change in refractive indices for crystals depending on their stoichiometry has been found. For non-stoichiometric and stoichiometric samples, $\Delta n/\Delta T$ varies more than twice from 1.3 $\cdot$ 10$^{-4}$ to 3.1 $\cdot$ 10$^{-4}$ K$^{-1}$. The absorption coefficient of the studied samples in the range 0.5–1.2 THz was less than 20 cm$^{-1}$. The change in the refractive index of HgGa$_2$S$_4$ in the range 0.5–1.2 THz was 3.42–3.55 at $T$ = 300 K.

Keywords: mercury thiogallate, terahertz spectrum, stoichiometry.

Received: 12.05.2023
Revised: 19.07.2023
Accepted: 30.10.2023

DOI: 10.61011/OS.2023.11.57018.5090-23



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