Diamond containing the negatively charged nitrogen-vacancy (NV) center is emerging as a significant new system for magnetometry. However, most NV sensors require microscopes to collect the fluorescence signals and are therefore limited to laboratory settings. By incorporating micron-scale diamond particles at an annular interface within the cross section of a silicate glass fiber, a high-sensitivity and robust fiber platform for magnetic field sensing is demonstrated here. The fluorescence and spin properties of NV centers embedded in the diamond crystals are well preserved during the fiber drawing process, leading to enhanced continuous-wave diamond-magnetometry in fiber-transmitted sensing configurations. The interface doping of diamond particles also leads to reduced fiber propagation loss and benefits the guidance of NV-fluorescence in the hybrid fiber. Using the diamond-fiber system, magnetic field readout through 50 cm of fiber is achieved. This study paves the way for novel fiber-based diamond sensors for field-deployable quantum metrology applications.

中文翻译：

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用于磁场传感的荧光金刚石微粒掺杂玻璃纤维

含有带负电荷的氮空位 (NV) 中心的金刚石正在成为一种重要的磁力测量新系统。然而，大多数 NV 传感器需要显微镜来收集荧光信号，因此仅限于实验室设置。通过在硅酸盐玻璃纤维横截面内的环形界面处加入微米级金刚石颗粒，这里展示了一种用于磁场传感的高灵敏度和坚固的纤维平台。嵌入在金刚石晶体中的 NV 中心的荧光和自旋特性在光纤拉制过程中得到很好的保存，从而在光纤传输传感配置中增强了连续波金刚石磁力测量。金刚石颗粒的界面掺杂也导致光纤传播损耗降低，并有利于混合光纤中 NV 荧光的引导。使用金刚石纤维系统，可实现通过 50 厘米纤维的磁场读数。这项研究为用于可现场部署的量子计量应用的新型纤维基金刚石传感器铺平了道路。