Picotesla-sensitivity microcavity optomechanical magnetometry.

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 (Q) 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-Q SiO₂ WGM microdisk. Theoretical studies are conducted to explore the magnetic actuation constant and noise-limit

SUBMITTER: Hu ZG 

PROVIDER: S-EPMC11439073 | biostudies-literature | 2024 Sep

REPOSITORIES: biostudies-literature