Optomechanical Magnetometry with a Macroscopic Resonator

Changqiu Yu, Jiri Janousek, Eoin Sheridan, David L. McAuslan, Halina Rubinsztein-Dunlop, Ping Koy Lam, Yundong Zhang, Warwick P. Bowen

    Research output: Contribution to journalArticlepeer-review

    44 Citations (Scopus)


    We demonstrate a centimeter-scale optomechanical magnetometer based on a crystalline whispering-gallery-mode resonator. The large size of the resonator, with a magnetic-field integration volume of 0.45 cm3, allows high magnetic-field sensitivity to be achieved in the hertz-to-kilohertz frequency range. A peak sensitivity of 131 pT Hz-1/2 is reported, in a magnetically unshielded noncryogenic environment using optical power levels beneath 100 μW. Femtotesla-range sensitivity may be possible in future devices with the further optimization of laser noise and the physical structure of the resonator, allowing applications in high-performance magnetometry.

    Original languageEnglish
    Article number044007
    JournalPhysical Review Applied
    Issue number4
    Publication statusPublished - 15 Apr 2016


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