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arXiv · 1309.6300

Cavity optomechanics in gallium phosphide microdisks

Matthew Mitchell·Aaron C. Hryciw·Paul E. Barclay
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Abstract

We demonstrate gallium phosphide (GaP) microdisk optical cavities with intrinsic quality factors $ > 2.8\times10^{5}$ and mode volumes $< 10 (λ/n)^3$, and study their nonlinear and optomechanical properties. For optical intensities up to $8.0\times10^4$ 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 $μ$m and several mechanical resonances, and measure an optical spring effect consistent with a theoretically predicted optomechanical coupling rate $g_0/2π\sim 30$ kHz for the fundamental mechanical radial breathing mode at 488 MHz.

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Matthew Mitchell, Aaron C. Hryciw, Paul E. Barclay. 2014-05-29. Cavity optomechanics in gallium phosphide microdisks. https://doi.org/10.1063/1.4870999

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