title: Cavity optomechanical magnetometer.
abstract: A cavity optomechanical magnetometer is demonstrated. The magnetic-field-induced expansion of a magnetostrictive material is resonantly transduced onto the physical structure of a highly compliant optical microresonator and read out optically with ultrahigh sensitivity. A peak magnetic field sensitivity of 400  nT  Hz(-1/2) is achieved, with theoretical modeling predicting the possibility of sensitivities below 1  pT  Hz(-1/2). This chip-based magnetometer combines high sensitivity and large dynamic range with small size and room temperature operation.
authors.affiliation: School of Mathematics and Physics, University of Queensland, St Lucia, Queensland 4072, Australia.
authors.forename: S
authors.initials: S
authors.lastname: Forstner
authors.forename: S
authors.initials: S
authors.lastname: Prams
authors.forename: J
authors.initials: J
authors.lastname: Knittel
authors.forename: E D
authors.initials: ED
authors.lastname: van Ooijen
authors.forename: J D
authors.initials: JD
authors.lastname: Swaim
authors.forename: G I
authors.initials: GI
authors.lastname: Harris
authors.forename: A
authors.initials: A
authors.lastname: Szorkovszky
authors.forename: W P
authors.initials: WP
authors.lastname: Bowen
authors.forename: H
authors.initials: H
authors.lastname: Rubinsztein-Dunlop
mesh_terms: D060306:Magnetometry / Q000295:instrumentation*; D008962:Models, Theoretical; D055095:Optics and Photonics / Q000295:instrumentation*