Design of tunable GHz-frequency optomechanical crystal resonators

Abstract

We present a silicon optomechanical nanobeam design with a dynamically tunable acoustic mode at 10.2 GHz. The resonance frequency can be shifted by 90 kHz/V^2 with an on-chip capacitor that was optimized to exert forces up to 1 $\mu$N at 10 V operation voltage. Optical resonance frequencies around 190 THz with Q factors up to $2.2\times 10^6$ place the structure in the well-resolved sideband regime with vacuum optomechanical coupling rates up to $g_0/2\pi =353$ kHz. Tuning can be used, for instance, to overcome variation in the device-to-device acoustic resonance frequency due to fabrication errors, paving the way for optomechanical circuits consisting of arrays of optomechanical cavities.

arXiv comment13 pages, 5 figures

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• A frequency-tunable nanomembrane mechanical oscillator with embedded quantum dots
• Realization of the degenerate parametric oscillator in electromechanical systems
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