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 , and project a photon shot-noise-limited sensitivity of for a few mW of infrared light, and a quantum projection-noise-limited sensitivity of for the sensing volume of .
- Received 10 January 2014
DOI:https://doi.org/10.1103/PhysRevLett.112.160802
© 2014 American Physical Society
Viewpoint
Ultrasensitive Diamond Magnetometers
Published 23 April 2014
Researchers have boosted the sensitivity of laser-based diamond magnetometers by using an optical cavity to enhance spin-photon coupling.
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