Temperature dispersions of refractive indices and absorption coefficients of mercury thiogallate crystals in the terahertz frequency range
Stroganova E. V.1, Badikov D. V.1, Shevyrdyaeva G. S.1, Galutskiy V. V.1
1Kuban State University, Krasnodar, Russia
Email: stroganova@kubsu.ru
THz absorption and refraction spectra of HgGa2S4 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, Δ n/Δ T varies more than twice from 1.3·10-4 to 3.1·10-4 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 HgGa2S4 in the range 0.5-1.2 THz was 3.42-3.55 at T=300 K. Keywords: mercury thiogallate, terahertz spectrum, stoichiometry.
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