Wideband microwave resonator for NV center vector magnetometry

Authors:S.V. Bolshedvorskii, E.A. Koreshin, V.V. Soshenko, I.S. Cojocaru, S.M. Drofa, P.G. Vilyuzhanina, N.I. Salangin, A.M. Kozodaev, A. Chernyavskiy, A.N. Smolyaninov, P.V. Kapitanova, S.Ya. Kilin, A.V. Akimov

Abstract:The nitrogen-vacancy (NV) color center in diamond has found applications in magnetometry across various geometrical scales. In particular, vector magnetometry using hand-held devices with low power consumption is of interest for mobile and geological applications. However, such a device requires efficient driving of the four different orientations of the NV center, thus placing demands on a broadband microwave resonator that provides a uniform and highly insensitive microwave magnetic field at the resonance frequencies of the NV centers. Here, we propose a unique planar resonator design that enables efficient driving of all four orientations of NV color centers over a 100 MHz range with only 0.5 W of microwave input power and 250 mW of laser power, allowing vector magnetic field measurements. Using the planar resonator to drive NV centers in diamond, a compact vector magnetometer was fabricated and experimentally studied. The sensitivity of the device is about \[{1.2\text{ nT}}/{\sqrt{\text{Hz}}}\;\]. While this is not a record sensitivity for diamond-based magnetometers, this device occupies its own niche as a compact hand-held magnetometer.

arXiv:2610.13379 [quant-ph]

(or arXiv:2610.13379v1 [quant-ph] for this version)

https://doi.org/10.48550/arXiv.2610.13379 arXiv-issued DOI via DataCite (pending registration)