Zhao Yifan, Ding Shihan, Wang Shuo, Hu Yiming, Liu Hongliang, Shang Zhen, Gu Yongjian
College of Physics and Optoelectronic Engineering, Ocean University of China, Qingdao 266100, China.
Engineering Research Center of Advanced Marine Physical Instruments and Equipment of Ministry of Education, Ocean University of China, Qingdao 266100, China.
Sensors (Basel). 2025 Jul 2;25(13):4123. doi: 10.3390/s25134123.
Color centers in solids, such as nitrogen-vacancy (NV) centers in diamonds, have gained significant attention in recent years due to their exceptional properties for quantum sensing. In this work, we demonstrate an NV center-based temperature sensor integrated into an optical waveguide to enable internal temperature sensing. A surface-cladding optical waveguide was fabricated in a diamond wafer containing NV centers using femtosecond laser direct writing. By analyzing the resonant peaks of optically detected magnetic resonance (ODMR) spectra, we established a precise correlation between temperature changes induced by the pump laser and shifts in the ODMR peak positions. This approach enabled temperature monitoring with a sensitivity of 1.1 mK/Hz. These results highlight the significant potential of color centers in solids for non-contact, micro-scale temperature monitoring.
固体中的色心，例如钻石中的氮空位（NV）中心，近年来因其在量子传感方面的卓越特性而备受关注。在这项工作中，我们展示了一种集成在光波导中的基于NV中心的温度传感器，以实现内部温度传感。使用飞秒激光直写技术在含有NV中心的金刚石晶圆中制造了一种表面包层光波导。通过分析光探测磁共振（ODMR）光谱的共振峰，我们建立了泵浦激光引起的温度变化与ODMR峰位置偏移之间的精确关联。这种方法能够以1.1 mK/Hz的灵敏度进行温度监测。这些结果突出了固体中色心在非接触、微尺度温度监测方面的巨大潜力。
