Broadband Tuning of Optomechanical Cavities

Details Broadband Tuning of Optomechanical Cavities Broadband Tuning of Optomechanical Cavities

2010-11-09

arxiv.org/abs/1011.2067v2

Optics Express, Vol. 19, Issue 3, pp. 2782-2790 (2011

Physics

Optics

7 pages, 4 figures Changes: Corrected typos, extended arguments; results unchanged

Scientific paper

10.1364/OE.19.002782

We demonstrate broadband tuning of an optomechanical microcavity optical resonance by exploring the large optomechanical coupling of a double-wheel microcavity and its uniquely low mechanical stiffness. Using a pump laser with only 13 mW at telecom wavelengths we show tuning of the silicon nitride microcavity resonances over 32 nm. This corresponds to a tuning power efficiency of only 400 $\mu$W/nm. By choosing a relatively low optical Q resonance ($\approx$18,000) we prevent the cavity from reaching the regime of regenerative optomechanical oscillations. The static mechanical displacement induced by optical gradient forces is estimated to be as large as 60 nm.

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