Nitrogen-vacancy ensemble magnetometry based on pump absorption

Sepehr Ahmadi, Haitham A. R. El-Ella, Adam M. Wojciechowski, Tobias Gehring, J. Bindslev Hansen, Alexander Huck, Ulrik L. Andersen

Abstract

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 $\sim$ 100 nT/$\sqrt{\textrm{Hz}}$ spanning a bandwidth up to 125 Hz. We project a photon shot-noise-limited sensitivity of $\sim$ 1 pT/$\sqrt{\textrm{Hz}}$ by optimizing the nitrogen-vacancy concentration and the detection method.

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• Physical review. B./Physical review. B - View
• arXiv (Cornell University) - View - PDF
• Technical University of Denmark, DTU Orbit (Technical University of Denmark, DTU) - View - PDF
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