Cavity optomechanics with surface acoustic waves

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We report a development of an electro-optomechanical system based on a surface acoustic wave (SAW), where a piezoelectric material with a large optoelastic susceptibility is used for the coupling of both a radio wave and optical light to the SAW.

• In the optical domain, we exploit a tensorial nature of the optoelastic effect to show a polarization dependence of the photon-SAW interaction.
• We discuss the construction of two-dimensional SAW focusing circuits for the coupling enhancement and the optical cavity enhanced photon-phonon scattering.
• We estimate an optomechanical coupling rate $g_0$ of the system and discuss the future direction for the improvement of the coupling strength.