High-Q nanomechanical torsion beams for quantum experiments and precision sensing

Christian M. Pluchar; Aman R. Agrawal; Charles A. Condos; Jon Pratt; Stephan Schlamminger; Dalziel Wilson

doi:10.1117/12.2635905

3 October 2022 High-Q nanomechanical torsion beams for quantum experiments and precision sensing

Christian M. Pluchar, Aman R. Agrawal, Charles A. Condos, Jon Pratt, Stephan Schlamminger, Dalziel Wilson

Author Affiliations +

Proceedings Volume PC12198, Optical Trapping and Optical Micromanipulation XIX; PC121980U (2022) https://doi.org/10.1117/12.2635905
Event: SPIE Nanoscience + Engineering, 2022, San Diego, California, United States

Abstract

We present a new class of ultra-high-Q nanomechanical resonators based on torsion modes of high-stress nanoribbons, and explore their application for quantum optomechanics experiments and precision optomechanical sensing. Specifically, we show that nanoribbons made of high stress silicon nitride support torsion modes which are naturally soft-clamped, yielding dissipation dilution factors as high as 10^4 and Q factors as high as 10^8 for the fundamental mode. We show that these modes can be read out with optical lever measurements with an imprecision below that at the standard quantum limit, paving the way for a new branch of torsional quantum optomechanics. We also show that nanoribbons can be mass-loaded without changing their torsional Q factor. We use this strategy to engineer a chip-scale torsion balance with an damping rate of 10 micro-hertz. We use this torsion balance as a clock gravimeter to sence micro-g fluctuation in the local gravitational field strength.

Conference Presentation

Citation Download Citation

Christian M. Pluchar, Aman R. Agrawal, Charles A. Condos, Jon Pratt, Stephan Schlamminger, and Dalziel Wilson "High-Q nanomechanical torsion beams for quantum experiments and precision sensing", Proc. SPIE PC12198, Optical Trapping and Optical Micromanipulation XIX, PC121980U (3 October 2022); https://doi.org/10.1117/12.2635905

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