Light-scattering study of the localization of longitudinal acoustic pseudomodes in a buried silica layer
- 15 April 1995
- journal article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 51 (15), 9875-9880
- https://doi.org/10.1103/physrevb.51.9875
Abstract
Brillouin light spectroscopy in p-p backscattering geometry is used to study sagittal surface acoustic phonons in silicon on insulator structures formed on a silicon buffer. The experimental spectra show, near the longitudinal threshold of silicon, two peaks whose physical meaning is discussed by comparison with theoretical cross sections. Calculations of Brillouin cross sections were performed, taking into account both the ripple and elastooptic coupling mechanisms. The peaks originate from two pseudomodes: the first is highly localized in the buried layer and the second in the top silicon layer. The dependence of the pseudomode localization and cross section intensity with the parallel wave vector and with the thickness of the top silicon layer are discussed.
Keywords
This publication has 13 references indexed in Scilit:
- Theory of the elasto-optic coupling for surface Brillouin scattering in a supported bilayerPhysical Review B, 1995
- Brillouin scattering from shear horizontal surface phonons in silicon on insulator structures: Theory and experimentPhysical Review B, 1994
- Localization of the surface acoustic longitudinal pseudomode of silicon in a buriedlayerPhysical Review B, 1994
- Brillouin scattering from shear horizontal surface phonons in buried SiO2layersJournal of Physics: Condensed Matter, 1994
- Selective determination of the C11 elastic constant in unsupported Ag/Ni superlattices by brillouin scatteringSolid State Communications, 1992
- Evidence for the existence of guided longitudinal acoustic phonons in ZnSe films on GaAsPhysical Review Letters, 1988
- Theory of Brillouin scattering from surface acoustic phonons in supported filmsJournal of Physics C: Solid State Physics, 1983
- Strong interference effects in surface Brillouin scattering from a supported transparent filmPhysical Review B, 1982
- Light scattering from surface acoustic phonons in metals and semiconductorsSolid State Communications, 1978
- Theory of Surface-Ripple Brillouin Scattering by SolidsPhysical Review Letters, 1978