Zhao, Yi and Wilson, Dalziel J. and Ni, K.-K. and Kimble, H. J. (2012) Suppression of extraneous thermal noise in cavity optomechanics. Optics Express, 20 (4). pp. 3586-3612. ISSN 1094-4087. http://resolver.caltech.edu/CaltechAUTHORS:20120420-100753870
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Extraneous thermal motion can limit displacement sensitivity and radiation pressure effects, such as optical cooling, in a cavity-optomechanical system. Here we present an active noise suppression scheme and its experimental implementation. The main challenge is to selectively sense and suppress extraneous thermal noise without affecting motion of the oscillator. Our solution is to monitor two modes of the optical cavity, each with different sensitivity to the oscillator’s motion but similar sensitivity to the extraneous thermal motion. This information is used to imprint “anti-noise” onto the frequency of the incident laser field. In our system, based on a nano-mechanical membrane coupled to a Fabry-Pérot cavity, simulation and experiment demonstrate that extraneous thermal noise can be selectively suppressed and that the associated limit on optical cooling can be reduced.
|Additional Information:||© 2012 Optical Society of America. Received 15 Dec 2011; revised 20 Jan 2012; accepted 20 Jan 2012; published 30 Jan 2012. We gratefully acknowledge P. Rabl from whom we learned the analytic tools for the formulation of our feedback scheme and J. Ye and P. Zoller who contributed many insights, including the transverse-mode scheme for differential sensing implemented in this paper. This work was supported by the DARPA ORCHID program, by the DoD NSSEFF program, by NSF Grant PHY-0652914, and by the Institute for Quantum Information and Matter, an NSF Physics Frontiers Center with support from the Gordon and Betty Moore Foundation. Yi Zhao gratefully acknowledges support from NSERC.|
|Group:||IQIM, Institute for Quantum Information and Matter|
|Classification Code:||OCIS Codes: (200.4880) Optomechanics; (120.6810) Thermal effects; (270.2500) Fluctuations, relaxations, and noise; (140.3320) Laser cooling; (140.4780) Optical resonators; (280.4788) Optical sensing and sensors|
|Official Citation:||Yi Zhao, Dalziel J. Wilson, K.-K. Ni, and H. J. Kimble, "Suppression of extraneous thermal noise in cavity optomechanics," Opt. Express 20, 3586-3612 (2012) http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-4-3586|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||23 Apr 2012 21:44|
|Last Modified:||26 Dec 2012 15:05|
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