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arXiv · 1110.2271

Cavity Optomechanical Magnetometer

S. Forstner·S. Prams·J. Knittel·E. D. van Ooijen·J. D. Swaim·G. I. Harris·A. Szorkovszky·W. P. Bowen·H. Rubinsztein-Dunlop
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Abstract

A cavity optomechanical magnetometer is demonstrated where the magnetic field induced expansion of a magnetostrictive material is transduced onto the physical structure of a highly compliant optical microresonator. The resulting motion is read out optically with ultra-high sensitivity. Detecting the magnetostrictive deformation of Terfenol-D with a toroidal whispering gallery mode (TWGM) resonator a peak sensitivity of 400 nT/Hz^.5 was achieved with theoretical modelling predicting that sensitivities of up to 500 fT/Hz^.5 may be possible. This chip-based magnetometer combines high-sensitivity and large dynamic range with small size and room temperature operation.

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S. Forstner, S. Prams, J. Knittel, E. D. van Ooijen, J. D. Swaim, G. I. Harris, A. Szorkovszky, W. P. Bowen, H. Rubinsztein-Dunlop. 2012-02-22. Cavity Optomechanical Magnetometer. https://doi.org/10.1103/physrevlett.108.120801

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