A Fully-integrated Diamond Nitrogen-Vacancy Magnetometer with Nanotesla Sensitivity

• URL: http://arxiv.org/abs/2508.03237v1
• Date: Tue, 05 Aug 2025 09:06:45 GMT
• Title: A Fully-integrated Diamond Nitrogen-Vacancy Magnetometer with Nanotesla Sensitivity
• Authors: Yulin Dai, Wenhui Tian, Qing liu, Bao Chen, Yushan Liu, Qidi Hu, Zheng Ma, Yunpeng Zhai, Haodong Wang, Ying Dong, Nanyang Xu,
• Abstract summary: This study introduces a fully integrated DNV magnetometer that encompasses all the essential components typically found in traditional platforms.<n>In contrast to previous efforts, we successfully address these challenges by integrating a high-power laser, a lock-in amplifier, and a digitally-modulated microwave source.<n>These home-made components show comparable performance with commercial devices under our circumstance, resulting in an optimal sensitivity of 2.14 nT/sqrtHz.
• Score: 6.235588868921862
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Ensemble diamond nitrogen-vacancy (DNV) centers have emerged as a promising platform for precise earth-field vector magnetic sensing, particularly in applications that require high mobility. Nevertheless, integrating all control utilities into a compact form has proven challenging, thus far limiting the sensitivity of mobile DNV magnetometers to the uT-level. This study introduces a fully integrated DNV magnetometer that encompasses all the essential components typically found in traditional platforms, while maintaining compact dimensions of approximately 13 cm * 26 cm. In contrast to previous efforts, we successfully address these challenges by integrating a high-power laser, a lock-in amplifier, and a digitally-modulated microwave source. These home-made components show comparable performance with commercial devices under our circumstance, resulting in an optimal sensitivity of 2.14 nT/sqrt{Hz}. The limitations in this system as well as possible future improvements are discussed. This work paves the way for the use of DNV magnetometry in cost-effective, mobile unmanned aerial vehicles, facilitating a wide range of practical applications.

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