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Optical read out and feedback cooling of a nanostring optomechanical cavity

Krause, Alex G. and Blasius, Tim D. and Painter, Oskar (2015) Optical read out and feedback cooling of a nanostring optomechanical cavity. . (Submitted)

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Optical measurement of the motion of a 940 kHz mechanical resonance of a silicon nitride nanostring resonator is demonstrated with a read out noise imprecision reaching 37 dB below that of the resonator's zero-point fluctuations. Via intensity modulation of the optical probe laser, radiation pressure feedback is used to cool and damp the mechanical mode from an initial room temperature occupancy of n_b=6.5×10^6 (T_b=295K) down to a phonon occupation of (n)=66±10, representing a mode temperature of T_m≈3mK. The five decades of cooling is enabled by the system's large single-photon cooperativity (C_1=4) and high quantum efficiency of optical motion detection (η_t=0.27).

Item Type:Report or Paper (Discussion Paper)
Related URLs:
URLURL TypeDescription Paper
Painter, Oskar0000-0002-1581-9209
Additional Information:The authors would like to thank Dal Wilson and Kartik Srinivasan for helpful discussions. This work was supported by the DARPA QuASaR program through a grant from the Army Research Office, the Institute for Quantum Information and Matter, an NSF Physics Frontiers Center with support of the Gordon and Betty Moore Foundation, and the Kavli Nanoscience Institute at Caltech. TDB gratefully acknowledges support from the National Science Foundation Graduate Research Fellowship Program (grant no. 0703267).
Group:Institute for Quantum Information and Matter, Kavli Nanoscience Institute
Funding AgencyGrant Number
NSF Graduate Research FellowshipDGE-0703267
Army Research Office (ARO)UNSPECIFIED
Institute for Quantum Information and Matter (IQIM)UNSPECIFIED
Gordon and Betty Moore FoundationUNSPECIFIED
Kavli Nanoscience InstituteUNSPECIFIED
Defense Advanced Research Projects Agency (DARPA)UNSPECIFIED
Record Number:CaltechAUTHORS:20150824-081716175
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:59829
Deposited By: Joy Painter
Deposited On:24 Aug 2015 16:06
Last Modified:02 Jun 2023 00:22

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