15 March 2013 High contrast grating mirrors for radiation-pressure optomechanics
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Proceedings Volume 8633, High Contrast Metastructures II; 86330N (2013) https://doi.org/10.1117/12.2005958
Event: SPIE OPTO, 2013, San Francisco, California, United States
Abstract
Subwavelength diffraction gratings patterned into a silicon nitride membrane offer a novel new platform for cavity optomechanics. The monolithic device combines high reflectivity, high mechanical quality factor, and low mass. Here we survey results we have obtained using such a device as one mirror of a Fabry-Perot cavity. With a cavity finesse of F ≈ 2000, we are able to optically cool hundreds of mechanical modes of the membrane. The lowest effective temperature we achieve, by detuning a laser to the red side of an optical resonance, is approximately Teff = 1 K. The cooling is accompanied by an optically-induced shift of the mechanical frequency, as expected; both the degree of cooling and frequency shift are proportional to the power of the cooling laser. When we detune the laser to the blue side of the resonance, the resulting optical “antidamping” causes the dynamics of the mechanical system to change from thermal to oscillatory, with a well-defined phase. Finally, we computationally investigate the feasibility of a proposal to realize radiation pressure optomechanics without a cavity, by use of a subwavelength grating with a rapid variation of reflectivity with wavelength.
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Utku Kemiktarak, Mathieu Durand, Corey Stambaugh, John Lawall, "High contrast grating mirrors for radiation-pressure optomechanics", Proc. SPIE 8633, High Contrast Metastructures II, 86330N (15 March 2013); doi: 10.1117/12.2005958; https://doi.org/10.1117/12.2005958
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