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Dispersive optomechanics of supercavity modes in high-index disks

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Abstract

In this work, we study the dispersive coupling between optical quasi-bound states in the continuum at telecom wavelengths and GHz-mechanical modes in high-index wavelength-sized disks. We show that such cavities can display values of the optomechanical coupling rate on par with optomechanical crystal cavities (${g_0}/2\pi \simeq 800\;{\rm{kHz}}$). Interestingly, optomechanical coupling of optical resonances with mechanical modes at frequencies well above 10 GHz seems attainable. We also show that mechanical leakage in the substrate can be extremely reduced by placing the disk over a thin silica pedestal. Our results suggest a new route for ultra-compact optomechanical cavities that can potentially be arranged in massive arrays forming optomechanical metasurfaces for application in signal processing or sensing.

© 2020 Optical Society of America

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