Cao Shun, Xing Yuxin, Sun Yuwei, Liu Zhenchao, He Sailing
Centre for Optical and Electromagnetic Research, National Engineering Research Center for Optical Instruments, Zhejiang University, Hangzhou 310058, China.
Shanghai Institute for Advanced Study, Zhejiang University, Shanghai 200135, China.
Nanomaterials (Basel). 2022 Apr 23;12(9):1440. doi: 10.3390/nano12091440.
The strong coupling between single quantum emitters and resonant optical micro/nanocavities is beneficial for understanding light and matter interactions. Here, we propose a plasmonic nanoantenna placed on a metal film to achieve an ultra-high electric field enhancement in the nanogap and an ultra-small optical mode volume. The strong coupling between a single quantum dot (QD) and the designed structure is investigated in detail by both numerical simulations and theoretical calculations. When a single QD is inserted into the nanogap of the silver nanoantenna, the scattering spectra show a remarkably large splitting and anticrossing behavior of the vacuum Rabi splitting, which can be achieved in the scattering spectra by optimizing the nanoantenna thickness. Our work shows another way to enhance the light/matter interaction at a single quantum emitter limit, which can be useful for many nanophotonic and quantum applications.
单量子发射体与共振光学微/纳腔之间的强耦合有利于理解光与物质的相互作用。在此，我们提出一种置于金属薄膜上的等离子体纳米天线，以在纳米间隙中实现超高电场增强和超小光学模式体积。通过数值模拟和理论计算详细研究了单个量子点（QD）与所设计结构之间的强耦合。当单个量子点插入银纳米天线的纳米间隙中时，散射光谱显示出真空拉比分裂的显著大分裂和反交叉行为，通过优化纳米天线厚度可在散射光谱中实现这一行为。我们的工作展示了在单量子发射体极限下增强光/物质相互作用的另一种方法，这对许多纳米光子学和量子应用可能有用。
