Interference of ordinary and extraordinary waves in AgAsS2 crystals

Abstract

The anisotropy of the near-bandgap absorption is investigated in AgAsS2 crystals. The refraction indices, n and n respectively for the Ec and Ec polarizations as well as the spectral dependence of the refraction indices difference, Δn=n−n are determined from the interference spectra of AgAsS2 crystals. A transmission band with four maxima is observed in the transmission spectra of crystals placed between crossed polarizers. The optical parameters n, k, ε1, and ε2 for the Ec and Ec polarizations are calculated from the reflection spectra by using the Kramers–Kronig relations.