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APS » Journals » Phys. Rev. Lett. » Volume 101 » Issue 19
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Phys. Rev. Lett. 101, 197203 (2008) [4 pages]

Dynamical Backaction of Microwave Fields on a Nanomechanical Oscillator

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J. D. Teufel1,*, J. W. Harlow1,2, C. A. Regal3, and K. W. Lehnert1,2
1JILA, National Institute of Standards and Technology and the University of Colorado, Boulder, Colorado 80309, USA
2Department of Physics, University of Colorado, Boulder, Colorado 80309, USA
3Norman Bridge Laboratory of Physics 12-33, California Institute of Technology, Pasadena, California 91125, USA

Received 18 July 2008; published 3 November 2008

We measure the response and thermal motion of a high-Q nanomechanical oscillator coupled to a superconducting microwave cavity in the resolved-sideband regime where the oscillator’s resonance frequency exceeds the cavity’s linewidth. The coupling between the microwave field and mechanical motion is strong enough for radiation pressure to overwhelm the intrinsic mechanical damping. This radiation-pressure damping cools the fundamental mechanical mode by a factor of 5 below the thermal equilibrium temperature in a dilution refrigerator to a phonon occupancy of 140 quanta.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.101.197203
DOI:
10.1103/PhysRevLett.101.197203
PACS:
85.85.+j, 42.50.Wk, 84.40.Dc, 85.25.−j

*john.teufel@colorado.edu

 
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