Cavity Enhancement of Anti-Stokes Scattering via Optomechanical Coupling with Surface Acoustic Waves

We report the development of an electro-optomechanical system based on surface acoustic waves (SAWs), where a piezoelectric material with a large optoelastic susceptibility is used for the coupling of both radiowaves and optical light to the SAW. In the optical domain, we exploit the tensorial nature of the optoelastic effect to show the polarization dependence of the photon-SAW interaction. We demonstrate increased coupling both by a two-dimensional SAW-focusing circuit and by the optical cavity enhancement of the photon-phonon scattering. We evaluate the optomechanical coupling rate of the system and discuss the future direction for the improvement of the coupling strength.