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Published December 15, 2006 | Published
Journal Article Open

Radiation Pressure Cooling of a Micromechanical Oscillator Using Dynamical Backaction


Cooling of a 58 MHz micromechanical resonator from room temperature to 11 K is demonstrated using cavity enhanced radiation pressure. Detuned pumping of an optical resonance allows enhancement of the blueshifted motional sideband (caused by the oscillator's Brownian motion) with respect to the redshifted sideband leading to cooling of the mechanical oscillator mode. The reported cooling mechanism is a manifestation of the effect of radiation pressure induced dynamical backaction. These results constitute an important step towards achieving ground state cooling of a mechanical oscillator.

Additional Information

©2006 The American Physical Society (Received 24 October 2006; published 14 December 2006) This work was funded via a Max Planck Independent Junior Research Group grant, a EU Marie Curie Grant (No. CMIRG-CT-2005-031141) and the DFG (NIM Initiative). The authors gratefully acknowledge J. Kotthaus for clean room access and J. Alnis for technical assistance. T.W. Hänsch, K. Karrai, and W. Zwerger are thanked for stimulating discussions. Note added. — After submission of this work, radiation pressure cooling of a micromechanical mirror by dynamical backaction [25,26] and active feedback [27] was reported.

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