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Q: Fachverband Quantenoptik und Photonik

Q 14: Quantum Technologies: Color Centers I (joint session Q/A/QI)

Q 14.4: Vortrag

Montag, 6. März 2023, 17:45–18:00, F342

Vector Magnetometry Based on Polarimetric Optically Detected Magnetic Resonance — Philipp Reuschel¹, Mario Agio^1,2, and •Assegid M. Flatae¹ — ¹Laboratory of Nano-Optics, University of Siegen, Siegen (Germany) — ²National Institute of Optics (INO), National Research Council (CNR), Sesto Fiorentino (Italy)

Vector magnetometry has various applications in navigation systems, spintronics and life sciences. So far, different sensitive magnetic field sensors exist, for example, superconducting quantum interference devices and alkali vapor cells magnetometers. However, they suffer from high technical complexity and low spatial resolution. Recently, negatively charged nitrogen-vacancy (NV-) color centers in diamond have been developed as sensitive magnetic field sensors based on the optically detected magnetic resonance (ODMR). However, these approaches require knowledge of the crystal axes and need an external magnetic bias field or they rely on the use of single NV- centers. Recently, by combining ODMRs of ensembles of NV- color centers with polarimetry, we have been able to determine the magnitude and direction of an unknown magnetic field [1]. A longitudinal laser polarization component enables the unequivocal distinction of the four crystal axes containing NV- centers, allowing high sensitivity and robust vector magnetometry without a bias field. Our approach is general for other spin-1 color centers with C3v symmetry, and it is compatible with standard microscopy methods. Reference [1] P. Reuschel, M. Agio, A. M. Flatae, Adv. Quantum Technol. 2200077 (2022).