A structure that is a resonator for photons and acoustic phonons and can be furthermore tuned to an exciton resonance is investigated. We present Raman-scattering experiments under double optical resonance, and we study the possibility of further enhancing the photon-phonon interaction by resonantly exciting an electronic state confined in the acoustic nanocavity spacer. We show that through this electronic resonance the confined acoustic mode can be amplified. In addition, we report the presence of features corresponding to the Brillouin zone edge and oscillations related to finite-size effects. A comparison with photoelastic model simulations is presented, showing a good agreement with the observed spectral features.

• Received 12 July 2008

DOI:https://doi.org/10.1103/PhysRevB.79.035404