Modelling of Cavity Optomechanical Magnetometers

Sensors
Yimin YuWarwick Paul Bowen

Abstract

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.

References

Nov 23, 2007·Optics Letters·T J KippenbergK J Vahala
Apr 7, 2010·Physical Review Letters·Kwan H LeeWarwick P Bowen
May 1, 2012·Physical Review Letters·S ForstnerH Rubinsztein-Dunlop
Jun 4, 2014·Advanced Materials·Stefan ForstnerWarwick P Bowen
Sep 23, 2014·Physical Review Letters·W MuesselM K Oberthaler
Nov 1, 2016·Nature Nanotechnology·Nicola RossiMartino Poggio
Nov 1, 2016·Nature Nanotechnology·Laure Mercier de LépinayOlivier Arcizet
Dec 3, 2016·Proceedings of the National Academy of Sciences of the United States of America·John F BarryRonald L Walsworth

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Citations

Mar 15, 2020·Sensors·Dmitry MurzinValeria Rodionova
Aug 29, 2021·Sensors·James S BennettWarwick P Bowen
Oct 19, 2020··Félix MirandaVarun Prakash

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Methods Mentioned

BETA
nuclear magnetic resonance
NMR
silicon-chip

Software Mentioned

COMSOL Multiphysics
COMSOL

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