A dynamical theory for inelastic Bragg scattering of electromagnetic waves from coupled systems of acoustic lattice waves and free-carrier density waves in opaque semiconducting crystals is formulated. On basis of a quasistatic two-wave interference approximation it is predicted that sound-induced anomalous transmission of light below the plasma edge can be obtained if the radiation is incident at the Bragg angle appropriate for dynamical diffraction. This anomalous transmission is to some extent analogous to the Borrmann effect for x rays in perfect crystals.
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Ole Keller (1978) studied this question.
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