Abstract
Resonant Brillouin Scattering in semi-insulating ZnSe is investigated at room temperature by using two kinds of injected acoustic waves; fast transverse and slow transverse modes. The observed dispersions in scattering cross section show the resonant enhancement and cancellation near the fundamental absorption edge, which are explained by theoretical analyses based upon Loudon's theory. Calculated dispersions taking account of exciton virtual states agree well with the experimental results. Resonant cancellation is explained in terms of the relevant photoelastic constants undergoing a sign reversal near the band edge, which was confirmed by the analyses of piezobirefringence theory.
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