摘要
在金刚石氮空位色心的高灵敏传感探测研究中,光学调控是氮空位色心实现高效光学初态制备及信息提取的关键.本文基于高浓度的金刚石氮空位色心系综检测展开,采用脉冲光学探测磁共振技术,系统地研究了激光初态极化时间、信息读取时间与激光功率的关联特性,并进一步研究了激光入射偏振角与传感信息精度的关系.探究了各个激光参数对高浓度金刚石氮空位色心系综[111]轴上光学探测磁共振谱中第一个共振峰的影响,并通过实验结果进行分析,最终选取在光功率密度为45.8 W/cm^2下的最优实验参数(300μs的极化时间,700 ns的读取时间,激光入射角为220°)进行了光学磁探测共振测试,与优化前的实验参数(极化时间为50μs,读取时间为3000 ns,入射角度为250°)相比,典型的磁检测灵敏度由21.6 nT/Hz1/2提升到5.6 nT/Hz1/2.以上研究结果表明我们已经实现光学精密调控的优化测量,这些研究结果也为高浓度氮空位色心系综精密调控实现温度和生物成像、量子计算及量子信息等领域调控传感检测提供了有效参考.
The nitrogen-vacancy(NV)centers in diamond have the advantages of stable triaxial structure,ultra-long electron spin coherence time and simple optical readout at room temperature.A nitrogen atom in the diamond crystal replaces a carbon atom and a vacancy is generated at the adjacent position,forming a point defect in the C3v space group structure.Its ground state and excited state are both spin triplet states.It is the key to achieving efficient preparation of optical initial state and extracting NV color center’s information in the researches of highly sensitive sensing magnetic detection,temperature detection,biological imaging,quantum computing,etc.However,there was no systematic study on relevant parameters of laser for high-concentration NV color center’s samples in previous experimental studies.Based on a high concentration diamond NV ensemble,we use pulsed optical detection magnetic resonance(ODMR)technology to systematically study the relationship among laser initial polarization time,information reading time and laser power,and the influence of laser incident polarization angle on the accuracy of sensing information.The effects of various laser parameters on the NV1 peak of ODMR on the[111]axis of the NVs of diamond are also investigated.The contrast of ODMR increases firstly with a sigmoid function and then decreases with an e-exponential function as the information reading time increases.The incident polarization angle of the laser is sinusoidal,with a period of 90°.According to the above experimental results,we finally choose the appropriate experimental parameters at 45.8 W/cm2(300μs of polarization,700 ns,reading time,laser incident angle is 220°)for ODMR test.Compared with previous experimental parameters(polarization time was 50 us,read the time of 3000 ns,laser incident angle was 250°),the experimental results show that the contrast of ODMR increases from 2.1%to 4.6%,and the typical magnetic sensitivity is improved from 21.6 nT/Hz1/2 to 5.6 nT/Hz1/2.The optimization of the optical control
作者
冯园耀
李中豪
张扬
崔凌霄
郭琦
郭浩
温焕飞
刘文耀
唐军
刘俊
Feng Yuan-Yao;Li Zhong-Hao;Zhang Yang;Cui Ling-Xiao;Guo Qi;Guo Hao;Wen Huan-Fei;Liu Wen-Yao;Tang Jun;Liu Jun(Key Laboratory of Instrumentation Science and Dynamic Measurement,Ministry of Education,North University of China,Taiyuan 030051,China;School of Instrument and Electronics,North University of China,Taiyuan 030051,China)
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2020年第14期222-227,共6页
Acta Physica Sinica
基金
国家科技重大专项(批准号:2017YFB0503100)
国家重大科研仪器设备研制专项(批准号:61727804)
国家自然科学基金(批准号:51635011,51727808,51922009,61704158)
山西省应用基础研究计划(批准号:201901D101011(ZD),201901D211254,201801D221202,201801D221213)
山西省重点研发项目(批准号:201803D121067)
山西省高等学校科技创新项目(批准号:2019L0558)
中北大学自然科学研究基金(批准号:XJJ201808)
山西省“1331工程”重点学科建设计划经费资助的课题.
关键词
氮空位色心
脉冲光学磁探测共振
激光参数
nitrogen-vacancy center
pulse optical magnetic resonance
laser parameters
