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QI: Fachverband Quanteninformation
QI 36: Quantum Metrology (joint session QI/Q)
QI 36.7: Talk
Friday, March 10, 2023, 12:30–12:45, F428
Infrared laser absorption magnetometry with Ensembles of Nitrogen-Vacancy centres — •Felipe Perona1,2, Julian Bopp2, Jonas Wollenberg2, and Tim Schröder1,2 — 1Ferdinand-Braun-Institut (FBH), Berlin, Germany — 2Humboldt-Universität zu Berlin, Department of Physics, Berlin, Germany
Magnetometers based on ensembles of Nitrogen-Vacancy (NV) centres have shown sub-nanotesla sensitivities [1]. The applied measurement concept relies on the detection and analysis of the intensity of the NV’s red fluorescence, which, under the proper conditions, encodes the value of a magnetic field at the defect location. A less explored approach is using the infrared absorption of the NV centre at 1042 nm as a medium to read its local magnetic environment [2]. This strategy avoids the necessity of implementing high photon collection efficiencies, improves the read-out contrast, and simplifies the sensing setup, allowing a higher degree of integration. In this work, we implement infrared laser absorption magnetometry and demonstrate that such magnetometer can reach high sensitivities. To maximize this sensitivity, we engineer the NV density of our diamonds and optimize it for this task. We integrate the concept into a compact device towards enabling miniaturized, portable magnetometers.
[1] H. Clevenson et al., “Broadband magnetometry and temperature sensing with a light-trapping diamond waveguide”, Nat. Phys., 11:5, 2015 [2] V. Acosta et al., “Broadband magnetometry by infrared-absorption detection of nitrogen-vacancy ensembles in diamond”, Appl. Phys. Lett., 97:17, 2010