Chip-scale gravimetry with ultralow loss torsion micropendula

Dalziel J. Wilson; Charles A. Condos

doi:10.1117/12.3012173

13 March 2024 Chip-scale gravimetry with ultralow loss torsion micropendula

Dalziel J. Wilson, Charles A. Condos

Proceedings Volume PC12912, Quantum Sensing, Imaging, and Precision Metrology II; PC129122Y (2024) https://doi.org/10.1117/12.3012173
Event: SPIE Quantum West, 2024, San Francisco, California, United States

Abstract

We present a new class of ultra-low-loss torsion micropendula based on strain-engineered nanomechanics, and explore their application as parametric (clock) gravimeters. Specifically, by suspending a 0.1 mg Si paddle from a strained silicon nitride nanoribbon, we realize a 30 Hz torsion micropendulum with a damping rate of 20 micro-Hz, a parametric acceleration sensitivity of 6 Hz/g, and thermal acceleration noise of 3 ng/rtHz. By driving the pendulum into self-oscillation, we realize a clock gravimeter with a frequency stability as low as 50 parts-per-billion, corresponding to an acceleration resolution of 300 ng. Currently the limitation is the intrinsic nonlinearity of the pendulum, which transduces amplitude drift into frequency drift. We demonstrate how the duffing nonlinearity of the suspension can be used to cancel this nonlinearity, paving the way towards a fully isochronous, high-Q micromechanical clock.

Conference Presentation

Citation Download Citation

Dalziel J. Wilson and Charles A. Condos "Chip-scale gravimetry with ultralow loss torsion micropendula", Proc. SPIE PC12912, Quantum Sensing, Imaging, and Precision Metrology II, PC129122Y (13 March 2024); https://doi.org/10.1117/12.3012173

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