Sail membranes for optomechanical accelerometry

Atkin D. Hyatt; Mitul Dey Chowdhury; Mahir Chowdhury; Mohamed J. Ahamed; Dalziel J. Wilson

optomechanics

Sail membranes for optomechanical accelerometry

arXiv:2607.14089

summary

The paper introduces sail‑like trampoline membrane resonators engineered via Bayesian optimization to achieve low‑frequency, high‑Q mechanical modes for optomechanical accelerometry, demonstrating centimeter‑scale devices with kHz frequencies and high Q‑mass products suitable for sensitive acceleration measurements.

Abstract

Strained membrane resonators have emerged as a promising platform for optomechanical accelerometry; however, the desired combination of low frequency and high $Q$ -mass product requires a rethinking of their dissipation dilution engineering. Applying Bayesian optimization to a Si $_{3}$ N $_{4}$ membrane, we discover a class of sail-like trampoline resonators in which the frequency is decreased by an order of magnitude while preserving the $Q$ -mass product. We demonstrate centimeter-scale sails with kHz frequencies, $Q \sim 1 0^{7}$ and $Q \times mass \sim$ 10 g. Vertically integrating a 7 kHz device with a nanoribbon, we realize a monolithic cavity optomechanical accelerometer with a room temperature thermal noise of $40 n g_{0} / Hz$ , sufficient to resolve $I^¼ g_{0} / Hz$ ambient vibration over a bandwidth of 4 kHz with a displacement imprecision of $1 0^{- 14} m / Hz$ . Cryogenic arrays of sail membranes may be attractive for new physics searches and distributed quantum sensing experiments.

Added additional funding awcknowledgement

Topics & keywords

#optomechanical accelerometry #strained membrane resonators #bayesian optimization #high‑Q low‑frequency sensors #cavity optomechanicsSi3N4 membranesail‑like trampolineQ‑mass productthermal noisenanoribbon integrationcavity optomechanical accelerometer