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Greatly Enhanced Plasmon–Exciton Coupling in Si/WS2/Au Nanocavities

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journal contribution
posted on 2021-12-28, 13:46 authored by Fu Deng, Hongxin Huang, Jing-Dong Chen, Shimei Liu, Huajian Pang, Xiaobing He, Sheng Lan
A strong light–matter interaction is highly desirable from the viewpoint of both fundamental research and practical application. Here, we propose a dielectric–metal hybrid nanocavity composed of a silicon (Si) nanoparticle and a thin gold (Au) film and investigate numerically and experimentally the coupling between the plasmons supported by the nanocavity and the excitons in an embedded tungsten disulfide (WS2) monolayer. When a Si/WS2/Au nanocavity is excited by the surface plasmon polariton generated on the surface of the Au film, greatly enhanced plasmon–exciton coupling originating from the hybridization of the surface plasmon polariton, the mirror-image-induced magnetic dipole, and the exciton modes is clearly revealed in the angle- or size-resolved scattering spectra. A Rabi splitting as large as ∼240 meV is extracted by fitting the experimental data with a coupled harmonic oscillator model containing three oscillators. Our findings open new horizons for constructing nanoscale photonic devices by exploiting dielectric–metal hybrid nanocavities.

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