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

doi:10.1103/PhysRevApplied.5.044007

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 journal › Article › peer-review

52 Citations (Scopus)

Abstract

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 language	English
Article number	044007
Journal	Physical Review Applied
Volume	5
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevApplied.5.044007
Publication status	Published - 15 Apr 2016

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10.1103/PhysRevApplied.5.044007

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title = "Optomechanical Magnetometry with a Macroscopic Resonator",

abstract = "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.",

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AU - Yu, Changqiu

AU - Janousek, Jiri

AU - Sheridan, Eoin

AU - McAuslan, David L.

AU - Rubinsztein-Dunlop, Halina

AU - Lam, Ping Koy

AU - Zhang, Yundong

AU - Bowen, Warwick P.

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AB - 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.

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Optomechanical Magnetometry with a Macroscopic Resonator

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