Microcavity exciton-polariton mediated Raman scattering: Experiments and theory

A. BRUCHHAUSEN, L. M. LEÓN HILARIO, A. A. ALIGIA, A. M. LOBOS, A. FAINSTEIN, B. JUSSERAND AND R. ANDRÉ

PHYSICAL REVIEW B

AMER PHYSICAL SOC

Lugar: New York; Año: 2008 vol. 78 p. 1253261 - 12532610

1098-0121

   We studied the intensity of resonant Raman scattering due to optical phonons in a planar II-VI-type semi-conductor microcavity in the regime of strong coupling between light and matter. Two different sets ofindependent experiments were performed at near outgoing resonance with the middle polariton MP branch ofthe cavity. In the first, the Stokes-shifted photons were kept at exact resonance with the MP, varying thephotonic or excitonic character of the polariton. In the second, only the incoming light wavelength was varied,and the resonant profile of the inelastic scattered intensity was studied when the system was tuned out of theresonant condition. Taking some matrix elements as free parameters, both independent experiments are quan-titatively described by a model which incorporates lifetime effects in both excitons and photons, and thecoupling of the cavity photons to the electron-hole continuum. The model is solved using a Green’s functionapproach which treats the exciton-photon coupling nonperturbatively.