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Nitrogen-Vacancy Ensemble Magnetometry Based on Pump Absorption

Physical review B/Physical review B(2018)

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摘要
We demonstrate magnetic-field sensing using an ensemble of nitrogen-vacancy centers by recording the variation in the pump-light absorption due to the spin-polarization dependence of the total ground-state population. Using a 532 nm pump laser, we measure the absorption of native nitrogen-vacancy centers in a chemical-vapor-deposited diamond placed in a resonant optical cavity. For a laser pump power of 0.4 W and a cavity finesse of 45, we obtain a noise floor of similar to 100 nT/root Hz spanning a bandwidth up to 125 Hz. We project a photon shot-noise-limited sensitivity of similar to 1 pT/root Hz by optimizing the nitrogen-vacancy concentration and the detection method.
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关键词
noise floor,nitrogen-vacancy center ensemble,pump light absorption,magnetic field sensing,nitrogen-vacancy ensemble magnetometry,frequency 10.0 mHz
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