Fujiwara Masazumi, Zhao Hong-Quan, Noda Tetsuya, Ikeda Kazuhiro, Sumiya Hitoshi, Takeuchi Shigeki
Opt Lett. 2015 Dec 15;40(24):5702-5. doi: 10.1364/OL.40.005702.
We demonstrate cooling of ultrathin fiber tapers coupled with nitrogen vacancy (NV) centers in nanodiamonds to cryogenic temperatures. Nanodiamonds containing multiple NV centers are deposited on the subwavelength 480-nm-diameter nanofiber region of fiber tapers. The fiber tapers are successfully cooled to 9 K using our home-built mounting holder and an optimized cooling speed. The fluorescence from the nanodiamond NV centers is efficiently channeled into a single guided mode and shows characteristic sharp zero-phonon lines (ZPLs) of both neutral and negatively charged NV centers. The present nanofiber/nanodiamond hybrid systems at cryogenic temperatures can be used as NV-based quantum information devices and for highly sensitive nanoscale magnetometry in a cryogenic environment.
我们展示了将与纳米金刚石中的氮空位（NV）中心耦合的超薄光纤锥冷却至低温。含有多个NV中心的纳米金刚石沉积在光纤锥直径为480 nm的亚波长纳米纤维区域上。使用我们自制的安装支架和优化的冷却速度，光纤锥成功冷却至9 K。纳米金刚石NV中心发出的荧光被有效地引导到单一导模中，并显示出中性和带负电NV中心的特征性尖锐零声子线（ZPL）。目前处于低温的纳米纤维/纳米金刚石混合系统可用作基于NV的量子信息器件，并用于低温环境下的高灵敏度纳米级磁力测量。
