Modelling of cavity optomechanical magnetometers.
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 5 p$\textrm{T}/\sqrt{\textrm{Hz}}$ at 28 $\mu$m resolution limited by thermal noise, showing potential for experimental improvement. Furthermore, by adjusting the composition of the magnetostrictive material and its annealing process, a sensitivity as good as 500 f$\textrm{T}/\sqrt{\textrm{Hz}}$ 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.
Publisher URL: http://arxiv.org/abs/1802.04661
DOI: arXiv:1802.04661v1
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