Photonics Research, 2020, 8 (7): 07001064, Published Online: Jun. 4, 2020   

Ultrabroadband and sensitive cavity optomechanical magnetometry Download: 717次

Author Affiliations
1 Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
2 School of Mathematics and Physics, The University of Queensland, St Lucia, QLD 4072, Australia
Abstract
Magnetostrictive optomechanical cavities provide a new optical readout approach to room-temperature magnetometry. Here we report ultrasensitive and ultrahigh bandwidth cavity optomechanical magnetometers constructed by embedding a grain of the magnetostrictive material Terfenol-D within a high quality (Q) optical microcavity on a silicon chip. By engineering their physical structure, we achieve a peak sensitivity of 26 pT/Hz comparable to the best cryogenic microscale magnetometers, along with a 3 dB bandwidth as high as 11.3 MHz. Two classes of magnetic response are observed, which we postulate arise from the crystallinity of the Terfenol-D. This allows single crystalline and polycrystalline grains to be distinguished at the level of a single particle. Our results may enable applications such as lab-on-chip nuclear magnetic spectroscopy and magnetic navigation.

Bei-Bei Li, George Brawley, Hamish Greenall, Stefan Forstner, Eoin Sheridan, Halina Rubinsztein-Dunlop, Warwick P. Bowen. Ultrabroadband and sensitive cavity optomechanical magnetometry[J]. Photonics Research, 2020, 8(7): 07001064.

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