Abstract
Resonant Brillouin scattering in CdS has been studied at room temperature by making use of piezoelectrically inactive T A phonon domains obtained by mode conversion upon partial reflection of acoustoelectrically amplified T A phonon domains at the end surface. It has been found that the dispersion of Brillouin scattering efficiency shows a new scattering maximum at a photon energy very close to the ground-state discrete exciton energy. A damping effect on the scattering mechanism has been discussed to explain the observed dispersion. The theoretical prediction based upon Loudon's light scattering theory has shown a quite good agreement with the present results when the damping effect is taken into account. The dispersion of photoelastic constant ( P 66 ) has been determined from the present data and compared with the piezobirefringence analyses.
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