Effect of Crystal Anisotropy on Differential Energy Spectra in Modulation Spectroscopy

Abstract

Line shapes of energy parameter modulated optical spectra and electrooptical signals in anisotropic crystals have been investigated. Density of states and complex dielectric functions in orthorhombic crystals are calculated in a tight binding approximation. Variations of the modulated spectra with changing crystal symmetry continuously from 1- of 2- to 3-dimension are examined. The results presented on a series of calculated spectra could be useful to understand the experimental results of modulation spectroscopy on real anisotropic crystals like layer-type and chain-like crystals.