Standing optical phonons in finite semiconductor superlattices studied by resonant raman scattering in a double microcavity

FAINSTEIN A, TRIGO M, OLIVA D, JUSSERAND B, FREIXANET T, THIERRY-MIEG V

PHYSICAL REVIEW LETTERS

Año: 2001 vol. 86 p. 3411 - 3414

0031-9007

We report optical double resonant enhancement of Raman scattering in a new double microcavity geometry. The design allows almost backscattering geometries, providing easy access to the excitations´ in-plane dispersion. The cavity is used to study the phonon spectra of a finite GaAs/AlAs superlattice. A new type of "standing optical vibration" is demonstrated involving the GaAs confined phonons with a standing wave envelope determined by the superlattice thickness. A strong dispersion of the first order standing wave mode is observed, as well as its anticrossing with higher order confined modes of the same symmetry.