Confinement and Raman scattering of acoustical vibrations in semiconductor layered cavities

M. TRIGO; A. BRUCHHAUSEN; A. FAINSTEIN; B. JUSSERAND; V. THIERRY-MIEG

Edinburgh, Scotland, UK

Conferencia; 26 International Conference on the Physics of Semiconductors (ICPS); 2002

Extending the idea of optical microcavities to sound waves, we propose a phonon cavity consisting of two semiconductor superlattices enclosing a spacer with thickness determined by the acoustic wavelength at the center of the first k=0 folded minigap. We show that acoustical phonons can be confined in these layered structures, and propose Raman experiments which are able to probe these novel excitations. The Raman experiments take profit of an optical microcavity scattering geometry that, through the forward-scattering contribution, gives access to the zone-center excitations. We present photoelastic model calculations of the Raman spectra of the proposed phonon-cavity embedded optical microcavity.