RESONANT BRILLOUIN-SCATTERING IN CDS BY PIEZOELECTRICALLY INACTIVE TA PHONON DOMAINS

Resonant Brillouin scattering in CdS has been studied at room temperature by making use of piezoelectrically inactive TA phonon domains obtained by mode conversion upon partial reflection of acoustoelectrically amplified TA 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 (P66) has been determined from the present data and compared with the piezobirefringence analyses. © 1978, THE PHYSICAL SOCIETY OF JAPAN. All rights reserved.