Enhanced emission collection of VB− in hexagonal boron nitride by solid immersion lens and plasmon
Yuan-Ze Yang, Wei Liu, Xiao-Dong Zeng, Nai-Jie Guo, Zhi-Peng Li, Lin-Ke Xie, Jun-You Liu, Yi-Tao Wang, Zhao-An Wang, Ji-Yang Zhou, Jin-Shi Xu, Jian-Shun Tang, Chuan-Feng Li, Guang-Can Guo- Physics and Astronomy (miscellaneous)
Hexagonal boron nitride (hBN) has brought widespread attention as a host material of various quantum emitters due to its two-dimensional nature and wide bandgap. Among the versatile quantum emitters in hBN, the negatively charged boron vacancy (VB−) stands out for its high contrast of optically detected magnetic resonance signal and the ability of spin control. Here, we report a method to implement 8.6-fold photoluminescence enhancement of VB− by using a solid immersion lens (SIL). We further combined an Au waveguide, Ag nanoparticles, and SIL to achieve an 18.6-fold photoluminescence overall enhancement of VB−. Our work provides a portable method to enhance the collection and emission efficiency of VB−, which is helpful for its practical applications in quantum technologies such as quantum sensing and quantum information.