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- Title
Plasmonic Enhancement and Manipulation of Optical Nonlinearity in Monolayer Tungsten Disulfide.
- Authors
Shi, Jinwei; Liang, Wei‐Yun; Raja, Soniya S.; Sang, Yungang; Zhang, Xin‐Quan; Chen, Chun‐An; Wang, Yanrong; Yang, Xinyue; Lee, Yi‐Hsien; Ahn, Hyeyoung; Gwo, Shangjr
- Abstract
Monolayer transition metal dichalcogenides (TMDCs) have large second‐order optical nonlinearity owing to broken inversion symmetry in two‐dimensional (2D) crystals. However, despite the strong light–matter coupling in monolayer TMDCs, their nonlinear responses are ultimately limited by subnanometer thickness. Here, a dramatic enhancement of the second‐harmonic generation (SHG) is achieved from monolayer tungsten disulfide (WS2) incorporated onto a 2D silver (Ag) nanogroove grating with subwavelength pitch. By tuning surface plasmon mode and second‐harmonic frequency in resonance with the C exciton in WS2, a large SHG enhancement factor (≈400) and a large conversion efficiency (≈2.0 × 10–5) can be obtained. Furthermore, the azimuthal angle dependence of polarized SHG from monolayer WS2 can be manipulated by the nanogroove plasmonic mode. Based on this property, a polarization‐modulated optical encoding technique is demonstrated. The results suggest that 2D TMDC–plasmonic hybrid metasurface structures can provide an ideal integration platform for on‐chip nonlinear photonics and plasmonics. Monolayer transition metal dichalcogenides (TMDCs) have large second‐order optical nonlinearity owing to broken inversion symmetry in 2D crystals, but their nonlinear responses are ultimately limited by subnanometer thickness. By incorporating onto a silver plasmonic metasurface, a dramatic enhancement of the second‐harmonic generation from monolayer tungsten disulfide is achieved with a large enhancement factor and a large conversion efficiency.
- Subjects
PLASMONICS; MONOMOLECULAR films; HARMONIC generation; TRANSITION metals; AZIMUTHAL projection (Cartography)
- Publication
Laser & Photonics Reviews, 2018, Vol 12, Issue 10, pN.PAG
- ISSN
1863-8880
- Publication type
Article
- DOI
10.1002/lpor.201800188