Letter | Published:

An optical tweezer phonon laser

Abstract

Phonon lasers are mechanical analogues of the ubiquitous optical laser and have been realized in a variety of contexts1,2,3,4,5,6,7,8,9,10,11,12. However, no such demonstration exists for mesoscopic levitated optomechanical systems, which are emerging as important platforms for conducting fundamental tests of quantum mechanics13,14,15 and gravity16, as well as for developing sensing modalities that couple mechanical motion to electron spin17,18,19,20 and charge21. Inspired by the pioneering work of Arthur Ashkin on optical tweezers22,23, we introduce a mesoscopic, frequency-tunable phonon laser based on the centre-of-mass oscillation of a silica nanosphere levitated in an optical tweezer under vacuum. Unlike previous levitated realizations, our scheme is general enough to be used on single electrons, liquid droplets or even small biological organisms24. Our device thus provides a pathway for a coherent source of phonons on the mesoscale that can be applied to both fundamental problems in quantum mechanics as well as tasks of precision metrology25,26,27.

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Data availability

The data that support the plots within this paper and other findings of this study are available from the corresponding authors upon reasonable request.

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Acknowledgements

R.M.P., D.R.L-M., J.T.S. and A.N.V. acknowledge generous support from the Institute of Optics and the Department of Physics and Astronomy at the University of Rochester and Office of Naval Research awards N00014-17-1-2285 and N00014-18-1-2370. W.G., P.K. and M.B. acknowledge support from Office of Naval Research awards N00014-14-1-0803 and N00014-17-1-2291 and useful discussions with J. Lawall and A.K. Jha.

Author information

M.B. and A.N.V. conceived the research. W.G. and P.K. performed the theoretical calculations, guided by M.B. R.M.P. performed the measurements. All authors discussed the data and wrote the manuscript.

Correspondence to Robert M. Pettit or Wenchao Ge or M. Bhattacharya or A. Nick Vamivakas.

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Fig. 1: Optical tweezer illustration and system model.
Fig. 2: Steady-state properties.
Fig. 3: Transient behaviour after the linear gain is switched on.