Nitrogen-vacancy ensemble magnetometry based on pump absorption

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.
Autorzy / Authors: 
S. Ahmadi, H.A.R. El-Ella, A.M. Wojciechowski, T. Gehring, J.O.B. Hansen, A. Huck, and U.L. Andersen
Phys. Rev. B 97, 024105
Tematyka badań: 
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Spektroskopia laserowa