中国物理B ›› 2024, Vol. 33 ›› Issue (10): 100701-100701.doi: 10.1088/1674-1056/ad73af

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Vector magnetometry in zero bias magnetic field using nitrogen-vacancy ensembles

Chunxing Li(李春兴)1,2, Fa-Zhan Shi(石发展)1,2,3, Jingwei Zhou(周经纬)1,2,3, and Peng-Fei Wang(王鹏飞)1,2,3,†   

  1. 1 CAS Key Laboratory of Microscale Magnetic Resonance and School of Physical Sciences, University of Science and Technology of China, Hefei 230026, China;
    2 CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China;
    3 Hefei National Laboratory, University of Science and Technology of China, Hefei 230088, China
  • 收稿日期:2024-04-30 修回日期:2024-08-25 接受日期:2024-08-27 发布日期:2024-09-29
  • 通讯作者: Peng-Fei Wang E-mail:wpf@ustc.edu.cn
  • 基金资助:
    Project supported by the National Key R&D Program of China (Grant Nos. 2021YFB3202800 and 2023YF0718400), Chinese Academy of Sciences (Grant No. ZDZBGCH2021002), Chinese Academy of Sciences (Grant No. GJJSTD20200001), Innovation Program for Quantum Science and Technology (Grant No. 2021ZD0303204), Anhui Initiative in Quantum Information Technologies, USTC Tang Scholar, and the Fundamental Research Funds for the Central Universities.

Vector magnetometry in zero bias magnetic field using nitrogen-vacancy ensembles

Chunxing Li(李春兴)1,2, Fa-Zhan Shi(石发展)1,2,3, Jingwei Zhou(周经纬)1,2,3, and Peng-Fei Wang(王鹏飞)1,2,3,†   

  1. 1 CAS Key Laboratory of Microscale Magnetic Resonance and School of Physical Sciences, University of Science and Technology of China, Hefei 230026, China;
    2 CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China;
    3 Hefei National Laboratory, University of Science and Technology of China, Hefei 230088, China
  • Received:2024-04-30 Revised:2024-08-25 Accepted:2024-08-27 Published:2024-09-29
  • Contact: Peng-Fei Wang E-mail:wpf@ustc.edu.cn
  • Supported by:
    Project supported by the National Key R&D Program of China (Grant Nos. 2021YFB3202800 and 2023YF0718400), Chinese Academy of Sciences (Grant No. ZDZBGCH2021002), Chinese Academy of Sciences (Grant No. GJJSTD20200001), Innovation Program for Quantum Science and Technology (Grant No. 2021ZD0303204), Anhui Initiative in Quantum Information Technologies, USTC Tang Scholar, and the Fundamental Research Funds for the Central Universities.

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摘要： The application of the vector magnetometry based on nitrogen-vacancy (NV) ensembles has been widely investigated in multiple areas. It has the superiority of high sensitivity and high stability in ambient conditions with microscale spatial resolution. However, a bias magnetic field is necessary to fully separate the resonance lines of optically detected magnetic resonance (ODMR) spectrum of NV ensembles. This brings disturbances in samples being detected and limits the range of application. Here, we demonstrate a method of vector magnetometry in zero bias magnetic field using NV ensembles. By utilizing the anisotropy property of fluorescence excited from NV centers, we analyzed the ODMR spectrum of NV ensembles under various polarized angles of excitation laser in zero bias magnetic field with a quantitative numerical model and reconstructed the magnetic field vector. The minimum magnetic field modulus that can be resolved accurately is down to $\sim 0.64 $ G theoretically depending on the ODMR spectral line width (1.8 MHz), and $\sim 2 $ G experimentally due to noises in fluorescence signals and errors in calibration. By using $^{13}$C purified and low nitrogen concentration diamond combined with improving calibration of unknown parameters, the ODMR spectral line width can be further decreased below 0.5 MHz, corresponding to $\sim 0.18 $ G minimum resolvable magnetic field modulus.

关键词: vector magnetometry, NV ensembles, optically detected magnetic resonance (ODMR), zero bias magnetic field

Abstract: The application of the vector magnetometry based on nitrogen-vacancy (NV) ensembles has been widely investigated in multiple areas. It has the superiority of high sensitivity and high stability in ambient conditions with microscale spatial resolution. However, a bias magnetic field is necessary to fully separate the resonance lines of optically detected magnetic resonance (ODMR) spectrum of NV ensembles. This brings disturbances in samples being detected and limits the range of application. Here, we demonstrate a method of vector magnetometry in zero bias magnetic field using NV ensembles. By utilizing the anisotropy property of fluorescence excited from NV centers, we analyzed the ODMR spectrum of NV ensembles under various polarized angles of excitation laser in zero bias magnetic field with a quantitative numerical model and reconstructed the magnetic field vector. The minimum magnetic field modulus that can be resolved accurately is down to $\sim 0.64 $ G theoretically depending on the ODMR spectral line width (1.8 MHz), and $\sim 2 $ G experimentally due to noises in fluorescence signals and errors in calibration. By using $^{13}$C purified and low nitrogen concentration diamond combined with improving calibration of unknown parameters, the ODMR spectral line width can be further decreased below 0.5 MHz, corresponding to $\sim 0.18 $ G minimum resolvable magnetic field modulus.

Key words: vector magnetometry, NV ensembles, optically detected magnetic resonance (ODMR), zero bias magnetic field

中图分类号:  (Magnetometers for magnetic field measurements)

  • 07.55.Ge
07.57.Pt (Submillimeter wave, microwave and radiowave spectrometers; magnetic resonance spectrometers, auxiliary equipment, and techniques) 76.70.Hb (Optically detected magnetic resonance (ODMR)) 76.30.Mi (Color centers and other defects)