Journal
OPTICS EXPRESS
Volume 25, Issue 16, Pages 19568-19582Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.25.019568
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- Office of Naval Research (ONR) [N00014-14-1-0803]
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We analyze magnetometry using an optically levitated nanodiamond. We consider a configuration where a magnetic field gradient couples the mechanical oscillation of the diamond with its spin degree of freedom provided by a nitrogen vacancy center. First, we investigate the measurement of the position spectrum of the mechanical oscillator. We find that conditions of ultrahigh vacuum and feedback cooling allow a magnetic field gradient sensitivity of 1 mu Tm-1 / root Hz. At high pressure and room temperature, this sensitivity degrades and can attain a value of the order of 100 mTm(-1)/ root Hz. Subsequently, we characterize the magnetic field gradient sensitivity obtainable by maneuvering the spin degrees of freedom using Ramsey interferometry. We find that this technique can offer photon-shot noise and spin-projection noise limited magnetic field gradient sensitivity of 100 mu Tm-1/ root Hz. We conclude that this hybrid levitated nanomechanical magnetometer provides a favorable and versatile platform for sensing applications. (C) 2017 Optical Society of America
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