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arXiv · 0905.2716

Mechanical oscillation and cooling actuated by the optical gradient force

Qiang Lin·Jessie Rosenberg·Xiaoshun Jiang·Kerry J. Vahala·Oskar Painter
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Abstract

In this work we combine the large per-photon optical gradient force with the sensitive feedback of a high quality factor whispering-gallery microcavity. The cavity geometry, consisting of a pair of silica disks separated by a nanoscale gap, shows extremely strong dynamical backaction, powerful enough to excite giant coherent oscillations even under heavily damped conditions (mechanical Q=4). In vacuum, the threshold for regenerative mechanical oscillation is lowered to an optical input power of only 270-nanoWatts, or roughly 1000 stored cavity photons, and efficient cooling of the mechanical motion is obtained with a temperature compression factor of 13-dB for 4-microWatts of dropped optical input power.

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Qiang Lin, Jessie Rosenberg, Xiaoshun Jiang, Kerry J. Vahala, Oskar Painter. 2009-05-17. Mechanical oscillation and cooling actuated by the optical gradient force. https://doi.org/10.1103/physrevlett.103.103601

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