Abstract
Mechanical resonators are widely used in sensors, transducers and optomechanical systems, where mechanical dissipation sets the ultimate limit to performance. Over the past 15 years, the quality factors in strained mechanical resonators have increased by four orders of magnitude, surpassing the previous state of the art achieved in bulk crystalline resonators at room temperature and liquid helium temperatures. In this Review, we describe how these advances were made by leveraging ‘dissipation dilution’—where dissipation is reduced through a combination of static tensile strain and geometric nonlinearity in dynamic strain. We then review the state of the art in strained nanomechanical resonators and discuss the potential for even higher quality factors in crystalline materials. Finally, we detail current and future applications of dissipation-diluted mechanical resonators.
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Acknowledgements
We thank A. Arabmoheghi, M. J. Bereyhi and S. A. Fedorov for insightful exchanges and assistance with figure preparation. We are also grateful to S. Schmid for multiple relevant discussions. This work was supported by funding from the Swiss National Science Foundation under grant agreement no. 185870 (Ambizione) and grant agreement no. 204927 (Cavity Quantum Electro-optomechanics). We further acknowledge funding from the European Research Council (ERC) under the EU H2020 Research and Innovation programme, grant agreement no. 835329 (ExCOM-cCEO).
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Engelsen, N.J., Beccari, A. & Kippenberg, T.J. Ultrahigh-quality-factor micro- and nanomechanical resonators using dissipation dilution. Nat. Nanotechnol. (2024). https://doi.org/10.1038/s41565-023-01597-8
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DOI: https://doi.org/10.1038/s41565-023-01597-8