Résumé -Nous présentons quelques aspects qualitatifs, qui découlent de la symétrie, de la diffusion Brillouin à l'interface vide-milieu cubique dispersif. Nous démontrons l'absence d'effet du polariton d'exciton sur le pic dû à 1'onde de Rayleigh.Abstract -We discuss qualitative, symmetry dependent, features of Brillouin scattering by an interface vacuum -cubic dispersive medium. The peak due to Rayleigh wave is shown to be unaffected by exciton polariton formation.Spatial dispersion (SD) effects due to wavevector dependence of the dielectric function have been extensively studied since the phenomenological model of Pekar /I/ and Hopfield and Thomas /2/. Recently, the great development oftunable lasers stimulated a very thorough investigation of these effects and led to the elucidation of several important features of SD materials. In particular, resonant Brillouin scattering (RBS) is a very useful tool to clarify their fundamental properties, mainly in reasonably pure, direct-gap semiconductors at sufficiently low temperatures /3, 4, 5, 6/.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.