Picotesla-sensitivity microcavity optomechanical magnetometry

Zhi-Gang Hu; Yi-Meng Gao; Jian-Fei Liu; Hao Yang; Min Wang; Yuechen Lei; Xin Zhou; Jincheng Li; Xuening Cao; Jinjing Liang; Chao-Qun Hu; Zhilin Li; Yong-Chang Lau; Jian-Wang Cai; Bei-Bei Li

doi:10.1038/s41377-024-01643-7

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Picotesla-sensitivity microcavity optomechanical magnetometry

Original Articles

- Picotesla-sensitivity microcavity optomechanical magnetometry
- Light: Science & Applications Vol. 13, Issue 11, Pages: 2835-2846(2024)
- Affiliations：
  
  1.Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
  2.University of Chinese Academy of Sciences, Beijing 100049, China
  3.School of Physics, Beihang University, Beijing 100191, China
  4.Songshan Lake Materials Laboratory, Dongguan 523808 Guangdong, China
- Author bio：
  
  Yong-Chang Lau (yongchang.lau@iphy.ac.cn)
  Jian-Wang Cai (jwcai@iphy.ac.cn)
  Bei-Bei Li (libeibei@iphy.ac.cn)
- Funds：
- DOI：10.1038/s41377-024-01643-7
  CLC：
- Published：30 November 2024，
  
  Published Online：29 September 2024，
  
  Received：19 March 2024，
  
  Revised：07 September 2024，
  
  Accepted：16 September 2024
- Accepted：
Scan QR Code
Hu, Z. G. et al. Picotesla-sensitivity microcavity optomechanical magnetometry. Light: Science & Applications, 13, 2835-2846 (2024).
DOI：

Hu, Z. G. et al. Picotesla-sensitivity microcavity optomechanical magnetometry. Light: Science & Applications, 13, 2835-2846 (2024). DOI： 10.1038/s41377-024-01643-7.

摘要

Abstract

Cavity optomechanical systems have enabled precision sensing of magnetic fields

by leveraging the optical resonance-enhanced readout and mechanical resonance-enhanced response. Previous studies have successfully achieved mass-produced and reproducible microcavity optomechanical magnetometry (MCOM) by incorporating Terfenol-D thin films into high-quality (

) factor whispering gallery mode (WGM) microcavities. However

the sensitivity was limited to 585 pT Hz

−1/2

over 20 times inferior to those using Terfenol-D particles. In this work

we propose and demonstrate a high-sensitivity and mass

-produced MCOM approach by sputtering a FeGaB thin film onto a high-

SiO

WGM microdisk. Theoretical studies are conducted to explore the magnetic actuation constant and noise-limited sensitivity by varying the parameters of the FeGaB film and SiO

microdisk. Multiple magnetometers with different radii are fabricated and characterized. By utilizing a microdisk with a radius of 355 μm and a thickness of 1 μm

along with a FeGaB film with a radius of 330 μm and a thickness of 1.3 μm

we have achieved a remarkable peak sensitivity of 1.68 pT Hz

−1/2

at 9.52 MHz. This represents a significant improvement of over two orders of magnitude compared with previous studies employing sputtered Terfenol-D film. Notably

the magnetometer operates without a bias magnetic field

thanks to the remarkable soft magnetic properties of the FeGaB film. Furthermore

as a proof of concept

we have demonstrated the real-time measurement of a pulsed magnetic field simulating the corona current in a high-voltage transmission line using our developed magnetometer. These high-sensitivity magnetometers hold great potential for various applications

such as magnetic induction tomography and corona current monitoring.

关键词

Keywords

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