Article

Bulk crystalline optomechanics

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Abstract

Control of long-lived, high-frequency phonons using light offers a path towards creating robust quantum links, and could lead to tools for precision metrology with applications to quantum information processing. Optomechanical systems based on bulk acoustic-wave resonators are well suited for this goal in light of their high quality factors, and because they do not suffer from surface interactions as much as their microscale counterparts. However, so far these phonons have been accessible only electromechanically, using piezoelectric interactions. Here, we demonstrate customizable optomechanical coupling to macroscopic phonon modes of a bulk acoustic-wave resonator at cryogenic temperatures. These phonon modes, which are formed by shaping the surfaces of a crystal into a plano-convex phononic resonator, yield appreciable optomechanical coupling rates, providing access to high acoustic quality factors (4.2 × 107) at high phonon frequencies (13 GHz). This simple approach, which uses bulk properties rather than nanostructural control, is appealing for the ability to engineer optomechanical systems at high frequencies that are robust against thermal decoherence. Moreover, we show that this optomechanical system yields a unique form of dispersive symmetry-breaking that enables phonon heating or cooling without an optical cavity.

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Acknowledgements

Primary support for this work was provided by NSF MRSEC DMR-1119826. This work was supported in part by the Packard Fellowship for Science and Engineering and Yale University. The authors thank P. Fleury, Y. Chu, E. Kittlaus, N. Otterstrom, J. Harris, K. Johnson, A. Shkarin, A. Kashkanova and G. Harris for valuable feedback and discussions.

Author information

Author notes

  1. These authors contributed equally: W. H. Renninger, P. Kharel.

Affiliations

  1. Department of Applied Physics, Yale University, New Haven, CT, USA

    • W. H. Renninger
    • , P. Kharel
    • , R. O. Behunin
    •  & P. T. Rakich

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Contributions

W.H.R. and P.T.R. conceived the device and spectroscopy approach. W.H.R. conducted experiments to produce the initial results. W.H.R. and P.K. jointly advanced these techniques to produce the final results under the guidance of P.T.R. W.H.R. and P.K. developed simulation methods with input from R.O.B. and P.T.R. P.K. and R.O.B. developed the analytical theory with guidance from W.H.R. and P.T.R. All authors participated in the writing of this manuscript.

Competing interests

The authors declare no competing interests.

Corresponding authors

Correspondence to W. H. Renninger or P. T. Rakich.

Supplementary information

  1. Supplementary Information

    Supplementary notes, Supplementary Figures 1–18, Supplementary notes