title: Standing optical phonons in finite semiconductor superlattices studied by resonant Raman scattering in a double microcavity.
abstract: 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.
authors.affiliation: Centro Atómico Bariloche & Instituto Balseiro, C.N.E.A., 8400 S. C. de Bariloche, Argentina.
authors.forename: A
authors.initials: A
authors.lastname: Fainstein
authors.forename: M
authors.initials: M
authors.lastname: Trigo
authors.forename: D
authors.initials: D
authors.lastname: Oliva
authors.forename: B
authors.initials: B
authors.lastname: Jusserand
authors.forename: T
authors.initials: T
authors.lastname: Freixanet
authors.forename: V
authors.initials: V
authors.lastname: Thierry-Mieg