Fu Bowen, Dai Wenshuo, Yang Longlong, Dai Danjie, Yang Jingnan, Fan Zetao, Lin Hai, Li Hancong, Chen Xiqing, Rafiq Aftab, Lu Guowei, Zhang Douguo, Gong Qihuang, Xu Xiulai
State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics, School of Physics, Peking University, 100871 Beijing, China.
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, 100190 Beijing, China.
Nano Lett. 2025 Jan 15;25(2):722-729. doi: 10.1021/acs.nanolett.4c04976. Epub 2025 Jan 3.
Strong coupling between nanocavities and single excitons at room temperature is important for studying cavity quantum electrodynamics. However, the coupling strength is highly dependent on the spatial light-confinement ability of the cavity, the number of involved excitons, and the orientation of the electric field within the cavity. By constructing a hybrid cavity with a one-dimensional photonic crystal cavity and a plasmonic nanocavity, we effectively improve the quality factor, reduce the mode volume, and control the direction of the electric field using Bloch surface waves. After transferring a monolayer of WSe sandwiched in the hybrid nanocavities, a Rabi splitting of approximately 186 meV is obtained and the number of excitons involved in the coupling is reduced to 8. This is the smallest number reported to date for transition metal dichalcogenide (TMD) based systems, with an effective coupling strength per individual exciton reaching 17.6 meV, which is nearly double the highest reported value.
室温下纳米腔与单个激子之间的强耦合对于研究腔量子电动力学非常重要。然而，耦合强度高度依赖于腔的空间光限制能力、参与的激子数量以及腔内电场的方向。通过构建一个由一维光子晶体腔和等离子体纳米腔组成的混合腔，我们利用布洛赫表面波有效地提高了品质因数，减小了模式体积，并控制了电场方向。在将夹在混合纳米腔中的单层WSe₂转移后，获得了约186 meV的拉比分裂，并且参与耦合的激子数量减少到8个。这是迄今为止基于过渡金属二硫属化物（TMD）系统报道的最小数量，单个激子的有效耦合强度达到17.6 meV，几乎是报道的最高值的两倍。
