Authors
Si Kan, Xiaobo Han, Lin Luo, Zijian He, Wenjuan Huang, Xiaohong Li, Huatian Hu, Kai Wang
Published in
The journal of physical chemistry letters. Pages 5579-5585. May 28, 2025. Epub May 28, 2025.
Abstract
Strong coupling, as a unique paradigm of cavity quantum electrodynamics, provides an important foundation for exploring novel quantum phenomena. Under ambient conditions, exciton-plasmon strong coupling systems have developed rapidly with various exquisite nanocavity structures proposed and refined. Nanocavities based on metal nanoparticles, such as single-particle and nanoparticle-on-mirror (NPoM), offer excellent compatibility with exciton materials, making them significant platforms for studying plasmon-exciton strong coupling. However, the intrinsic losses of metallic materials severely limit the exploration of novel quantum phenomena such as low-threshold lasing and nonlinear properties. In this work, we propose and realize a plasmonic nanocavity based on high-refractive-index GaAs nanowires positioned on a Au substrate, forming a nanowire-on-mirror (NWoM) architecture. The NWoM nanocavities exhibit strong local field confinement and a significantly enhanced damage threshold, reaching 5.6×106 W/cm2. Furthermore, by integrating the nanocavity with monolayer WSe2, we successfully realized the strong coupling at room temperature. By tuning the diameters of the dielectric nanowires, we observe the characteristic anticrossing behavior and achieve a Rabi splitting of 140 meV. This study lays the foundation for future investigations into more efficient quantum behaviors and provides a new approach to designing low-loss strong coupling systems.
PMID:
40435351
Bibliographic data and abstract were imported from PubMed on 29 May 2025.
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