Greatly Enhanced Plasmon-Exciton Coupling in Si/WS 2 /Au Nanocavities.
Fu DengHongxin HuangJing-Dong ChenShimei LiuHuajian PangXiaobing HeSheng LanPublished in: Nano letters (2021)
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 (WS 2 ) monolayer. When a Si/WS 2 /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.
Keyphrases
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- ionic liquid
- gold nanoparticles
- minimally invasive
- high glucose
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