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

作　　者：Chunxing Li Fa-Zhan Shi Jingwei Zhou Peng-Fei Wang 李春兴;石发展;周经纬;王鹏飞(CAS Key Laboratory of Microscale Magnetic Resonance and School of Physical Sciences,University of Science and Technology of China,Hefei 230026,China;CAS Center for Excellence in Quantum Information and Quantum Physics,University of Science and Technology of China,Hefei 230026,China;Hefei National Laboratory,University of Science and Technology of China,Hefei 230088,China)

机构地区：[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

出　　处：《Chinese Physics B》2024年第10期21-29,共9页中国物理B（英文版）

基　　金：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.

摘　　要：The application of the vector magnetometry based on nitrogen-vacancy(NV)ensembles has been widely investigatedin multiple areas.It has the superiority of high sensitivity and high stability in ambient conditions with microscale spatialresolution.However,a bias magnetic field is necessary to fully separate the resonance lines of optically detected magneticresonance(ODMR)spectrum of NV ensembles.This brings disturbances in samples being detected and limits the rangeof 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 NVensembles under various polarized angles of excitation laser in zero bias magnetic field with a quantitative numerical modeland reconstructed the magnetic field vector.The minimum magnetic field modulus that can be resolved accurately is downto~0.64 G theoretically depending on the ODMR spectral line width(1.8 MHz),and~2 G experimentally due to noisesin fluorescence signals and errors in calibration.By using 13C purified and low nitrogen concentration diamond combinedwith improving calibration of unknown parameters,the ODMR spectral line width can be further decreased below 0.5 MHz,corresponding to~0.18 G minimum resolvable magnetic field modulus.

关 键 词：vector magnetometry NV ensembles optically detected magnetic resonance(ODMR) zero bias magnetic field 

分 类 号：TM936[电气工程—电力电子与电力传动]