Brillouin Scattering Near Rigid Interfaces

Abstract

R6sum6-Nous donnons un a p e r p des mesures de la diffusion Brillouin prss d'une interface liquide-solide pour differents rapports des impgdances acoustiques des milieux. Nous avons examin6 116thanol, le polycarbonate et les metaux liquides mercure et gallium en contact avec un support de verre solide. Nous prgsentons quelques mesures am6lior6es sur les modes de Lamb et de Love dans les couches minces de polycarbonate sur un support de verre Pyrex. Nous analysons de f a~o n d6taillge une onde du type Stoneley 2 l'interface m6tal liquide-verre. Notre interf6rom5tre am6lior6 du type Fabry-P6rot B double passage est d6crit brisvement.

Brillouin Scattering and its Application in Geosciences

“…Experimental studies performed with semiconductor layers supported by metals, have confirmed the importance of adding the elasto-optic contribution to fully interpret the observed spectral features (Sandercock 1978;Loudon and Sandercock 1980). Finally, theoretical studies have been carried out to predict the intensity of surface Brillouin scattering in dielectric and metallic liquids (Dil and Brody 1976;Albuquerque 1983) and the results have been utilized to interpret existing experimental results on alcohols, mercury and gallium (Dil and Brody 1976;Visser et al 1984).…”

“…Surface Brillouin scattering is in general not observable in transparent materials, where bulk effects dominate the scattered intensity. Brillouin scattering is a viable method to investigate acoustic wave velocities in opaque solids including metals (e.g., Mendik et al 1992;Graczykowski et al 2011) and metallic liquids (Visser et al 1984) and of metals at high pressures (Crowhurst et al 1999) and it represents a potential method to study the elastic properties of candidate planetary core materials at extreme conditions.…”

“…Brillouin scattering can be one technique to determine acoustic velocities of both solid and liquid metals at extreme conditions in the DAC. Surface Brillouin scattering of liquid metals has been reported at ambient conditions (Dil and Brody 1976) and the theory has been developed to interpret the spectral features present in spectra collected from the interface between a transparent container and a metal liquid (Visser et al 1984). In addition, surface Brillouin scattering of solid thin-film Au has been measured to a pressure of 4.8 GPa (Crowhurst et al 1999).…”