Heidelberg 2015 – wissenschaftliches Programm
A 7.7: Poster
Montag, 23. März 2015, 17:00–19:00, C/Foyer
Magnetometry with NV center ensembles — •Nathan Leefer1, Kasper Jensen2, Arne Wickenbrock3, Dionysis Antypas1, Yannick Dumeige4, Mariusz Mrózek5, and Dmitry Budker1,2 — 1Helmholtz Institut-Mainz, Mainz, Germany — 2Niels Bohr Institute, Copenhagen, Denmark — 3Johannes Gutenberg-Universität Mainz, Mainz, Germany — 4Université de Rennes 1, Rennes, France — 5Jagiellonian University, Kraków, Poland
We recently reported a cavity-enhanced room-temperature magnetic field sensor based on nitrogen-vacancy (NV) centers in diamond. The demonstrated sensitivity was 2.5 nT/√Hz for a sensing volume of ∼ 90 µm × 90 µm × 200 µm, with an estimated quantum projection-noise limit of 250 fT/√Hz. Magnetic resonance was detected using absorption of light resonant with the 1042-nm spin-singlet transition. The diamond was placed in an external optical cavity to enhance the absorption, providing significant absorption even at room temperature. We present new progress on improving the sensitivity of this device, some applications for such a miniaturized magnetometer, and new approaches for enhancing infrared absorption by NV centers in diamond without a resonant cavity.