Cavity-enhanced room-Temperature magnetometry using absorption by nitrogen-vacancy centers in diamond

Kasper Jensen (1) , Nathan Leefer (1) , Andrey Jarmola (1) , Yannick Dumeige (2) , Victor M. Acosta (1) , Pauli Kehayias (1) , Brian Patton (1, 3) , Dmitry Budker (1)

1 Department of Physics [Berkeley]
2 FOTON - Fonctions Optiques pour les Technologies de l'informatiON
3 Physik-Department

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 2.5 nT/√Hz, and project a photon shot-noise-limited sensitivity of 70 pT/√Hz for a few mW of infrared light, and a quantum projection-noise-limited sensitivity of 250 fT/√Hz for the sensing volume of ~90 μm×90 μm×200 μm.

Domaines: Optique [physics.optics]

Kasper Jensen, Nathan Leefer, Andrey Jarmola, Yannick Dumeige, Victor M. Acosta, et al.. Cavity-enhanced room-Temperature magnetometry using absorption by nitrogen-vacancy centers in diamond. Physical Review Letters, 2014, 112 (16), pp.160802. ⟨10.1103/PhysRevLett.112.160802⟩. ⟨hal-01006411⟩