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