A high-sensitivity fiber-coupled diamond magnetometer with surface coating

• URL: http://arxiv.org/abs/2102.12233v1
• Date: Wed, 24 Feb 2021 11:53:03 GMT
• Title: A high-sensitivity fiber-coupled diamond magnetometer with surface coating
• Authors: Shao-Chun Zhang, Hao-Bin Lin, Yang Dong, Bo Du, Xue-Dong Gao, Cui Yu, Zhi-Hong Feng, Xiang-Dong Chen, Guang-Can Guo, and Fang-Wen Sun
• Abstract summary: Nitrogen-vacancy quantum defects in diamond offer a promising platform for magnetometry. We present a high-sensitivity and wide-bandwidth fiber-based quantum magnetometer for practical applications.
• Score: 19.468384174783917
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Nitrogen-vacancy quantum defects in diamond offer a promising platform for magnetometry because of their remarkable optical and spin properties. In this Letter, we present a high-sensitivity and wide-bandwidth fiber-based quantum magnetometer for practical applications. By coating the diamond surface with silver reflective film, both the fluorescence collection and excitation efficiency are enhanced. Additionally, tracking pulsed optically detected magnetic resonance spectrum allowed a magnetic field sensitivity of $35$ pT$/\sqrt{\rm{Hz}}$ and a bandwidth of $4.1$ KHz. Finally, this magnetometer was successfully applied to map the magnetic field induced by the current-carrying copper-wire mesh. Such a stable and compact magnetometry can provide a powerful tool in many areas of physical, chemical, and biological researches.

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