Abstract
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.
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