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Ultra-low field magnetic field sensors are essential for many applications including geology, mineral exploration, archaeology and medicine [1]. However, such magnetometers typically either require cryogenic systems to operate, or suffer poor dynamic range, limiting their ability to operate in ambient conditions. Here, we demonstrate a microscale room temperature cavity optomechanical magnetometer...
This article describes in detail a technique for modeling cavity optomechanical field sensors. A magnetic or electric field induces a spatially varying stress across the sensor, which then induces a force on mechanical eigenmodes of the system. The force on each oscillator can then be determined from an overlap integral between magnetostrictive stress and the corresponding eigenmode, with the optomechanical...
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