Abstract

The phenomenological theory of light scattering by optical and acoustical phonons is reviewed. The resonance enhancement of Brillouin scattering by acoustical phonons in the vicinity of the intrinsic absorption edge is related to the enhancement of the elasto-optical and electro-optical constants. A macroscopic theory of resonance-enhanced Brillouin scattering by acoustical phonons analogous to that of resonance-enhanced Raman scattering by optical phonons is formulated in terms of the scattering of polaritons by the acoustic phonons via the exciton and continuum electron-hole pair excitation parts of the incident and scattered polaritons.

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