Ib型金刚石NV色心系综的制备及磁检测

Preparation of NV Center Ensembles in Type Ib Diamonds and Magnetic Detection

弱磁探测在材料科学、基础物理和磁强计等众多领域都具有重要的研究意义。由于金刚石氮空位（NV）色心的弱磁探测兼具高灵敏度与高空间分辨的优点,因此对利用Ib型金刚石NV色心系综进行磁检测的技术进行了研究。通过电子辐照并高温真空退火的方法制备了Ib型金刚石NV色心系综,并对其光致发光光谱进行了测试与分析;利用自主搭建的共聚焦系统成功检测了在不同微波功率作用下的NV色心系综电子自旋共振谱;测试并分析了常温常压中不同磁场条件下的NV色心系综电子自旋共振谱。结果表明,金刚石〈100〉晶轴方向的磁场使得NV色心系综基态的ms=＋1态与ms=-1态的共振峰产生4.053 MHz/Gs的能级分裂,利用此金刚石NV色心系综可实现4.98μT的弱磁检测。

The weak magnetic detection has important research significance in the fields of material science,basic physics,magnetometers and so on. Because the weak magnetic detection of nitrogen-vacancy（NV） center in diamond has the advantages of high sensitivity and high spatial resolution,the magnetic detection technology utilizing NV center ensembles in the type Ib diamond was studied. The NV center ensembles in type Ib diamonds were prepared by the electron irradiation and high temperature annealing in vacuum,and their photoluminescence spectra were tested and analyzed. And the electron spin resonance spectra of the NV center ensembles were successfully detected under the different microwave powers by the self-developed confocal system. Then,the electron spin resonance spectra of the NV center ensembles were tested and analyzed under different magnetic fields at the ambient temperature and pressure.The results show that the 4. 053 MHz/Gs energy level splitting of the NV center ensemble formants at ms=＋ 1 and ms=-1 was produced when applying magnetic fields in diamond 〈 100 〉 crystal axial direction.The 4. 98 μT weak magnetic detection can be realized by using the NV center ensembles in diamond.