Nitrogen-vacancy ensemble magnetometry based on pump absorption

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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 ∼100 nT/√Hz spanning a bandwidth up to 125 Hz. We project a photon shot-noise-limited sensitivity of ∼1 pT/√Hz by optimizing the nitrogen-vacancy concentration and the detection method.
Original languageEnglish
Article number024105
JournalPhysical Review B
Issue number2
Number of pages6
Publication statusPublished - 2018

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©2018 American Physical Society

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