“Cavity optomechanical magnetomety”
The resonant enhancement of both mechanical and optical response in microcavity optomechanical devices allows exquisitely sensitive measurements of stimuli such as acceleration, mass and magnetic fields. In this presentation, I will talk about silicon-chip based magnetometry using cavity optomechanical system. By incorporating a magnetostrictive material terfenol-D into the high-Q microcavity, high sensitivity on the order of tens of pT/Hz1/2 has been achieved, which is comparable to that of the similar-sized superconducting quantum interference device (SQUID) based magnetometry, without using cryogenic cooling. I will also show the recently developed scalable and reproducible fabrication pathway for cavity optomechanical magnetometers, through sputter coating a thin film of terfenol-D into the microcavity. Finally, I will talk about quantum enhanced cavity optomechanical magnetometry. By incorporating phase squeezed light into a cavity optomechanical magnetometer, both the sensitivity and the bandwidth of the sensor are improved.
Host: Jack Harris