期刊
ACS NANO
卷 13, 期 2, 页码 1739-1750出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.8b07826
关键词
resonance coupling; silicon nanospheres; magnetic dipole modes; two-dimensional excitons; two-dimensional materials
类别
资金
- National Natural Science Foundation of China [51290271, 11474364]
- Guangdong Natural Science Funds for Distinguished Young Scholars [2014A030306017]
- Science and Technology Department of Guangdong Province
- Pearl River S&T Nova Program of Guangzhou [201610010084]
- Guangdong Special Support Program [201428004]
- Fundamental Research Funds for the Central Universities [17lgzd05]
Light-matter resonance coupling is a long-studied topic for both fundamental research and photonic and optoelectronic applications. Here we investigated the resonance coupling between the magnetic dipole mode of a dielectric nanosphere and 2D excitons in a monolayer semiconductor. By coating an individual silicon nanosphere with a monolayer of WS2, we theoretically demonstrated that, because of the strong energy transfer between the magnetic dipole mode of the nanosphere and the A-exciton in WS2, resonance coupling evidenced by anticrossing behavior in the scattering energy diagram was observed, with a mode splitting of 43 meV. In contrast to plexcitons, which involve plasmonic nanocavities, the resonance coupling in this all-dielectric heterostructure was insensitive to the spacing between the silicon nanosphere core and the WS2 shell. Additionally, the two split modes exhibited distinct light-scattering directionality. We further experimentally demonstrated the resonance coupling effect by depositing silicon nanospheres with different diameters onto a WS2 monolayer and collecting the scattering spectra of the resulting heterostructures under ambient conditions. We further demonstrated active control of the resonance coupling by temperature scanning. Our findings highlighted the potential of our all-dielectric heterostructure as a solid platform for studying strong light-matter interactions at the nanoscale.
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