Quasi-Static Analysis of Resonant Brillouin Scattering in ZnSe, ZnTe and CdS

Abstract

The resonance data of Brillouin scattering by the acoustic phonon domains have been analyzed for ZnSe (slow-TA and fast-TA modes), ZnTe (slow-TA and fast-TA modes) and CdS (slow-TA, fast-TA and LA modes) in the photon-energy region near the fundamental absorption edges with a theoretical description based on the quasi-static approximation. The present analysis indicates that the Brillouin-scattering efficiency can be represented by the first derivative of the dielectric constant with respect to the incident-photon energy. The theoretical calculation has been performed by numerically differentiating the experimental data of the dielectric constant. The resonance behaviors of Brillouin scattering have been well interpreted by the quasi-static approximation when the non-dispersive contributions are properly taken into account. The quasi-static approximation has also indicated clearly that resonant Brillouin scattering is quite equivalent to the first-derivative modulation spectroscopy.