Nanodiamond-Based Optical-Fiber Quantum Probe for Magnetic Field and Biological Sensing

• DOI: 10.1021/acssensors.2c00670
• Publication Date: 2022-12-01T15:47:31Z
• Authors: Yaofei Chen; Qianyu Lin; Hongda Cheng; Huanhuan Huang; Jie Shao; Yingying Ye; Gui-Shi Liu; Lei Chen; Yunhan Luo; Zhe Chen
• Keywords: Nanodiamond; Quantum sensor; Nitrogen-vacancy center

Owing to the unique electronic spin properties, nitrogen-vacancy (NV) centers hosted in diamond have emerged as a powerful quantum tool for detecting various physical parameters and biological species. In this work, an optical-fiber probe, configured by chemically modifying nanodiamonds on surface of cone fiber tip, is developed. Based continuous-wave optically detected magnetic resonance method lock-in amplification technique, it found that sensing performance probes can be engineered varying nanodiamond dispersion concentration modification duration during chemical process. Combined with pair flux concentrators, field detection sensitivity has reached 0.57 nT/Hz1/2@1 Hz, new record among magnetometers based nanodiamonds. Taking Gd3+ demo, capability paramagnetic species also demonstrated experimentally. Our work provides approach develop NV featuring high integration, multifunction, sensitivity, etc.