16 September 2016 Cooling the mechanical motion of a tapered optical fiber and a microsphere-cantilever using whispering gallery modes
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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.
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Y. Lia Li, J. Millen, P. F. Barker, "Cooling the mechanical motion of a tapered optical fiber and a microsphere-cantilever using whispering gallery modes", Proc. SPIE 9922, Optical Trapping and Optical Micromanipulation XIII, 99220B (16 September 2016); doi: 10.1117/12.2238960; https://doi.org/10.1117/12.2238960
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