Mechanical oscillation and cooling actuated by the optical gradient force

Details Mechanical oscillation and cooling actuated by the optical gradient force Mechanical oscillation and cooling actuated by the optical gradient force

2009-05-17

arxiv.org/abs/0905.2716v1

Physics

Optics

29 pages, 8 figures

Scientific paper

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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