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Cavity-Enhanced Room-Temperature Magnetometry Using Absorption by Nitrogen-Vacancy Centers in Diamond

K. Jensen, N. Leefer, A. Jarmola, Y. Dumeige, V. M. Acosta, P. Kehayias, B. Patton, and D. Budker
Phys. Rev. Lett. 112, 160802 – Published 23 April 2014
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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 2.5nT/Hz, and project a photon shot-noise-limited sensitivity of 70pT/Hz for a few mW of infrared light, and a quantum projection-noise-limited sensitivity of 250fT/Hz for the sensing volume of 90μm×90μm×200μm.

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  • Received 10 January 2014

DOI:https://doi.org/10.1103/PhysRevLett.112.160802

© 2014 American Physical Society

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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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Authors & Affiliations

K. Jensen1,*, N. Leefer1,†, A. Jarmola1, Y. Dumeige2, V. M. Acosta1, P. Kehayias1, B. Patton1,3, and D. Budker1,‡

  • 1Department of Physics, University of California, Berkeley, California 94720-7300, USA
  • 2Université de Rennes 1, CNRS, UMR 6082 FOTON, Enssat, 6 rue de Kerampont, CS 80518, 22305 Lannion cedex, France
  • 3Physik-Department, Technische Universität München, 85748 Garching, Germany

  • *kjensen@nbi.dk
  • naleefer@uni-mainz.de
  • dbudker@gmail.com

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Issue

Vol. 112, Iss. 16 — 25 April 2014

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