Plasmonic Enhancement and Manipulation of Optical Nonlinearity in Monolayer Tungsten Disulfide

Jinwei Shi, Wei Yun Liang, Soniya S. Raja, Yungang Sang, Xin Quan Zhang, Chun An Chen, Yanrong Wang, Xinyue Yang, Yi Hsien Lee*, Hye Young Ahn, Shangjr Gwo

*此作品的通信作者

研究成果: Article同行評審

69 引文 斯高帕斯(Scopus)

摘要

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.

原文English
文章編號1800188
期刊Laser and Photonics Reviews
12
發行號10
DOIs
出版狀態Published - 10月 2018

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