期刊
ACS PHOTONICS
卷 6, 期 4, 页码 1002-1009出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.8b01771
关键词
light-emitting metasurfaces; Mie resonances; dielectric nanoantennas; transition metal dichalcogenides; 2D materials; excitonic emission
类别
资金
- Thuringian State Government within its ProExcellence initiative (ACP2020)
- German Research Foundation [STA 1426/2-1]
- German Ministry of Education and Research (BMBF) [13N14147]
- Erasmus Mundus NANOPHI project [2013 5659/002-001]
- Humboldt Foundation
- German Research Foundation (DFG) through the International Research Training Group (IRTG) [2101]
- Australian Government Research Training Program (RTP) Scholarship
- European Unions Horizon 2020
- DFG research and innovation programme FLAG-ERA [TU149/9-1]
We experimentally investigate coupling of the photoluminescence (PL) from monolayers of MoS2 to Mie-resonant metasurfaces consisting of silicon nanocylinders. By a systematic variation of the nanocylinder diameter, we sweep the metasurface resonances over the excitonic emission band of monolayer MoS2. We observe strong enhancement, as well as spectral and directional reshaping of the emission. By a comprehensive optical characterization, we unveil the different physical factors, including electronic, photonic, and mechanical influences, responsible for the observed PL changes. Importantly, we show that by geometrical tuning of the nanocylinder resonances, the emission can be tailored from occurring under very large angles to being directed out of the substrate plane. Our results highlight the need and potential of controlling not only the photonic, but also electronic and mechanical environmental factors for tailoring PL from TMD monolayers by integrating them in nanophotonic architectures.
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