期刊
ACS NANO
卷 12, 期 10, 页码 10393-10402出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.8b05880
关键词
plasmonics; plexciton; enhanced fluorescence; nanocavity; transition metal dichalcogenides
类别
资金
- National Key R&D Program of China [2017YFA0303504, 2017YFA0205800]
- National Key Basic Research Program [2015CB932400]
- National Natural Science Foundation of China [11674255, 11674256]
- China Postdoctoral Science Foundation [2014T70727]
The interaction between plasmons in metal nano-structures and excitons in layered materials attracts recent interests due to its fascinating properties inherited from the two constituents, e.g., the high tunability on its spectral or spatial properties from the plasmonic component, and the large optical nonlinearity or light emitting properties from the excitonic counterpart. Here, we demonstrate light-emitting plexcitons from the coupling between the neutral excitons in monolayer WSe2 and highly confined nanocavity plasmons in the nanocube-over-mirror system. We observe, simultaneously, an anticrossing dispersion curve of the hybrid system in the dark-field scattering spectrum and a 1700 times enhancement in the photoluminescence. We attribute the large photoluminescence enhancement to the increased local density of states by both the plasmonic and excitonic constituents in the intermediate coupling regime. In addition, increasing the confinement of the hybrid systems is achieved by shrinking down the size of the hot spot within the gap between the nanocube and the metal film. Numerical calculations reproduce the experimental observations and provide the effective number of excitons taking part in the interaction. This highly compact system provides a room temperature testing platform for quantum cavity electromagnetics at the deep subwavelength scale.
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