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Published July 2014 | Published
Journal Article Open

Silicon optomechanical crystal resonator at millikelvin temperatures

Abstract

Optical measurements of a nanoscale silicon optomechanical crystal cavity with a mechanical resonance frequency of 3.6 GHz are performed at subkelvin temperatures. We infer optical-absorption-induced heating and damping of the mechanical resonator from measurements of phonon occupancy and motional sideband asymmetry. At the lowest probe power and lowest fridge temperature (T_f=10 mK), the localized mechanical resonance is found to couple at a rate of γ_i/2π=400 Hz (Q_(m)=9×10^6) to a thermal bath of temperature T_b≈270 mK. These measurements indicate that silicon optomechanical crystals cooled to millikelvin temperatures should be suitable for a variety of experiments involving coherent coupling between photons and phonons at the single quanta level.

Additional Information

© 2014 American Physical Society. Received 24 March 2014; published 17 July 2014. The authors would like to thank Michael Roukes, Ron Lifshitz, and Michael Cross for helpful discussions regarding the proposed thermal model, as well as Jasper Chan, Witlef Wiezcorek, and Jason Hoelscher-Obermaier for support in the early stages of the experiment. This work was supported by the DARPA ORCHID and MESO programs, 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. A.S.N. acknowledges support from NSERC. S.G. was supported by a Marie Curie International Outgoing Fellowship within the 7th European Community Framework Programme. S.M.M., J.D.C., and S.G. contributed equally to this work.

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Published - PhysRevA.90.011803.pdf

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August 20, 2023
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October 17, 2023