Cavity Optomechanical Magnetometer
Stefan Forstner(University of Queensland), Stefan M. Prams(University of Queensland), Joachim Knittel(ARC Centre of Excellence for Engineered Quantum Systems), Erik van Ooijen(University of Queensland), Jon D. Swaim(University of Queensland), Glen I. Harris(University of Queensland), Alex Szorkovszky(University of Queensland), Warwick P. Bowen(University of Queensland), Halina Rubinsztein‐Dunlop(University of Queensland)
Cited by 300Open Access
Abstract
A cavity optomechanical magnetometer is demonstrated. The magnetic-field-induced expansion of a magnetostrictive material is resonantly transduced onto the physical structure of a highly compliant optical microresonator and read out optically with ultrahigh sensitivity. A peak magnetic field sensitivity of $400\text{ }\text{ }\mathrm{nT}\text{ }{\mathrm{Hz}}^{\ensuremath{-}1/2}$ is achieved, with theoretical modeling predicting the possibility of sensitivities below $1\text{ }\text{ }\mathrm{pT}\text{ }{\mathrm{Hz}}^{\ensuremath{-}1/2}$. This chip-based magnetometer combines high sensitivity and large dynamic range with small size and room temperature operation.
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