Double Brillouin scattering geometry

Abstract

A procedure to optimize the collection of Brillouin spectra and to allow the simultaneous observation of phonons in two pairs of scattering geometries is proposed. The first geometry is used to observe the bulk phonons in right-angle- and back-scattering. This procedure reduces measurement time and requires the use of only one type of sample. The second geometry is used for simultaneous observation of bulk and surface phonons in transparent materials and can provide some valuable information on the relation between the bulk and surface elastic properties.