Presentation Information
[8p-C310-3]Continuous-Wave Magnetic Field Sensing at Several Hundred MHz and Elucidation of Physical Mechanisms under Strong Transverse Magnetic Fields Using NV Centers in Diamond
〇(D)Ryusei Okaniwa1,2, Yuichiro Matsuzaki3, Rui Suzuki1,2, Norio Tokuda4, Junko Ishi-Hayase1,2 (1.Keio Univ., 2.Keio CSRN, 3.Chuo Univ., 4.Kanazawa Univ. ARCDia)
Keywords:
quantum sensor,nitrogen-vacancy center in diamond,broadband AC magnetic field sensing
Nitrogen-vacancy (NV) center in diamond is highly promising solid-state quantum sensors. NV-based sensing relies on optically detected magnetic resonance (ODMR). However, conventional pulsed ODMR sequences, such as XY-n, struggle to detect magnetic fields in the tens to hundreds of MHz range due to microwave (MW) intensity limitations. Although recent methods using continuous-wave decoupling or frequency mixers have achieved high-frequency detection, they require complex pulse sequences and still suffer from MW power constraints.
To overcome these challenges, this study demonstrates a continuous-wave (CW)-ODMR methodology for measuring magnetic fields in the several hundred MHz range, leveraging a strong perpendicular magnetic field and dressed states. Building on a previous 170 MHz demonstration, we successfully detect magnetic fields exceeding 400 MHz. Furthermore, we clarify how the perpendicular magnetic field strength affects the asymmetric ODMR lineshape, linewidth, contrast, and overall sensitivity. Finally, we discuss the optimal fixed MW frequencies by incorporating the contributions of 14N nuclear spins.
To overcome these challenges, this study demonstrates a continuous-wave (CW)-ODMR methodology for measuring magnetic fields in the several hundred MHz range, leveraging a strong perpendicular magnetic field and dressed states. Building on a previous 170 MHz demonstration, we successfully detect magnetic fields exceeding 400 MHz. Furthermore, we clarify how the perpendicular magnetic field strength affects the asymmetric ODMR lineshape, linewidth, contrast, and overall sensitivity. Finally, we discuss the optimal fixed MW frequencies by incorporating the contributions of 14N nuclear spins.