摘要金刚石氮-空位(nitrogen-vacancy,NV-)色心系综在温度测量原理上具有超高灵敏、微纳米级空间分辨率的特点,该方法利用色心最外层2个未成对电子自旋相互作用产生的零场分裂能实现温度测量,通常采用灵敏度分析方法来衡量其温度敏感信号的信噪比。为有效提高灵敏度,推导了无外加磁场时连续式温度测量灵敏度的理论模型,分析了影响信噪比的主要因素;优化了微波天线直径、激光和微波功率对光探测磁共振(optically detected magnetic resonance,ODMR)谱线线宽和荧光对比度的影响。在303～318K范围内标定了零场分裂能D与温度T的关系,得到系统所用高浓度色心样品的dD/dT为-73.42kHz/K,标定结果的相对标准偏差为5.3%。最终对不同温度的灵敏度进行测量,低频段平均灵敏度达到0.50K/Hz1/2(＜10Hz)的水平。
Abstract：The temperature measurement based on nitrogen-vacancy (NV-) centers in diamond has the merits of ultra-high sensitivity and micro-nano spatial resolution, which is realized through the zero-field splitting energy generated by spin-spin interaction between the two unpaired electrons in the outermost layer of the NV- center. Usually, analysis of sensitivity is used to judge the signal to noise ratio of the output signal. In order to improve the sensitivity, the theoretical model of continuous temperature measurement sensitivity without an applied magnetic field is derived, and the main interfering factors are analyzed. The effects of microwave antenna diameter, laser and microwave power on the linewidth and fluorescence contrast of optically detected magnetic resonance (ODMR) are optimized. The relationship between zero-field splitting energy D and temperature T is calibrated in the range of 303K to 318K. The coefficient dD/dT is -73.42kHz/K and the relative standard deviation is 5.3%. Finally, the sensitivity at different temperature is measured, and the low-frequency average sensitivity reaches the level of 0.5K/Hz1/2(＜10Hz).
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2023, Vol. 44 
