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Sensors 2018, 18(5), 1558;

Modelling of Cavity Optomechanical Magnetometers

ARC Centre for Engineered Quantum Systems, School of Mathematics and Physics, The University of Queensland, Brisbane, Queensland 4072, Australia
Author to whom correspondence should be addressed.
Received: 8 February 2018 / Revised: 11 May 2018 / Accepted: 11 May 2018 / Published: 14 May 2018
(This article belongs to the Special Issue Sensors Based on Quantum Phenomena)
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Cavity optomechanical magnetic field sensors, constructed by coupling a magnetostrictive material to a micro-toroidal optical cavity, act as ultra-sensitive room temperature magnetometers with tens of micrometre size and broad bandwidth, combined with a simple operating scheme. Here, we develop a general recipe for predicting the field sensitivity of these devices. Several geometries are analysed, with a highest predicted sensitivity of 180 p T / Hz at 28 μ m resolution limited by thermal noise in good agreement with previous experimental observations. Furthermore, by adjusting the composition of the magnetostrictive material and its annealing process, a sensitivity as good as 20 p T / Hz may be possible at the same resolution. This method paves a way for future design of magnetostrictive material based optomechanical magnetometers, possibly allowing both scalar and vectorial magnetometers. View Full-Text
Keywords: cavity-optomechanics; magnetometer; quantum sensing cavity-optomechanics; magnetometer; quantum sensing

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Yu, Y.; Forstner, S.; Rubinsztein-Dunlop, H.; Bowen, W.P. Modelling of Cavity Optomechanical Magnetometers. Sensors 2018, 18, 1558.

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