A hand-held magnetometer based on an ensemble of nitrogen-vacancy centers in diamond
Doudou Zheng, Zongmin Ma, Weijun Guo, Liumin Niu, Junqi Wang, Xiaohan Chai, Yanjun Li, Yasuhiro Sugawara, Cui Yu, Yunbo Shi, Xiaoming Zhang, Jun Tang, Hao Guo, Jun Liu
Abstract
Abstract The development of practical applications of the magnetometer based on ensemble of nitrogen-vacancy centers has been impeded by the large size of the system. In this paper, we present an integrated and miniaturized magnetic field sensor with a volume of approximately 10 cm 3 . Compared to the previous design, with the fluorescence waveguide excitation and collection structure, both the optical excitation system and collection system are integrated into a compact device by combining the optical fiber, so that it can be a handheld sensing head. We demonstrated experimentally that this sensor head enables the optically detected magnetic resonance measurements with or without the external magnetic field. Subsequently, we verified that the magnetic-field sensitivity is approximately 67 , and projected the photon shot noise limited sensitivity to be 2.04 . This novel system has considerable performance regarding previous designs while greatly reducing dimensions.