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Cavity-enhanced room-temperature magnetometry using absorption by nitrogen-vacancy centers in diamond
K Jensen1, N Leefer1, A Jarmola1
1Department of Physics, University of California, Berkeley, California 94720-7300, USA.
Abstract:
We demonstrate a cavity-enhanced room-temperature magnetic field sensor based on nitrogen-vacancy centers in diamond. Magnetic resonance is detected using absorption of light resonant with the 1042 nm spin-singlet transition. The diamond is placed in an external optical cavity to enhance the absorption, and significant absorption is observed even at room temperature. We demonstrate a magnetic field sensitivity of 2.5 nT/Hz, and project a photon shot-noise-limited sensitivity of 70 pT/Hz for a few mW of infrared light, and a quantum projection-noise-limited sensitivity of 250 fT/Hz for the sensing volume of ∼90 μm×90 μm×200 μm.
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