Cavity optomechanics in gallium phosphide microdisks

Abstract

We demonstrate gallium phosphide (GaP) microdisk optical cavities with intrinsic quality factors $>2.8\times 10^5$ and mode volumes $<10(\lambda /n{)}^3$, and study their nonlinear and optomechanical properties. For optical intensities up to $8.0\times 10^4$ intracavity photons, we observe optical loss in the microcavity to decrease with increasing intensity, indicating that saturable absorption sites are present in the GaP material, and that two-photon absorption is not significant. We observe optomechanical coupling between optical modes of the microdisk around 1.5 $\mu$m and several mechanical resonances, and measure an optical spring effect consistent with a theoretically predicted optomechanical coupling rate $g_0/2\pi \sim 30$ kHz for the fundamental mechanical radial breathing mode at 488 MHz.

Published Version

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