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Proceedings Paper

Cooling the mechanical motion of a tapered optical fiber and a microsphere-cantilever using whispering gallery modes
Author(s): Y. Lia Li; J. Millen; P. F. Barker
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Paper Abstract

Light coupled from a tapered optical fiber is used to excite the morphology dependent whispering gallery mode (WGM) resonances of a silica microsphere-cantilever. Using the optomechanical transduction from the WGM supported by the microsphere1, we can simultaneously detect the thermal Brownian motion of both the microsphere-cantilever and the tapered fiber used for coupling. This allows for active feedback cooling of multiple mechanical modes of the tapered fiber and the microsphere-cantilever using the optical dipole force and a piezo-stack2. Stabilisation of the coupling junction by employing simultaneous cooling of both oscillators is also presented2, useful for many hybrid WGM systems coupled with a tapered waveguide.

Paper Details

Date Published: 16 September 2016
PDF: 13 pages
Proc. SPIE 9922, Optical Trapping and Optical Micromanipulation XIII, 99220B (16 September 2016); doi: 10.1117/12.2238960
Show Author Affiliations
Y. Lia Li, Univ. College London (United Kingdom)
J. Millen, Univ. College London (United Kingdom)
P. F. Barker, Univ. College London (United Kingdom)

Published in SPIE Proceedings Vol. 9922:
Optical Trapping and Optical Micromanipulation XIII
Kishan Dholakia; Gabriel C. Spalding, Editor(s)

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