期刊
NANO LETTERS
卷 21, 期 14, 页码 6321-6327出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.1c02381
关键词
Two-dimensional materials; nonlinear optics; four-wave mixing; plasmonic enhancement; MoS2
类别
资金
- Aalto Centre for Quantum Engineering, Business Finland
- Academy of Finland [312297, 312551, 314810, 333982, 336144, 336818]
- Academy of Finland Flagship Programme (PREIN) [320167]
- European Union [820423, 965124]
- EU [H2020-MSCA-RISE-872049]
- ERC [834742]
- Japan Society for the Promotion of Science (JSPS) [19K15399, S19030]
- Grants-in-Aid for Scientific Research [19K15399] Funding Source: KAKEN
The study reports broadband enhancement of optical nonlinearity in monolayer MoS2 with plasmonic structures, demonstrating significantly enhanced four-wave mixing with an equivalent third-order nonlinearity in the order of 10(-17) m(2)/V-2. The enhancement factor is up to three orders of magnitude, showing promising potential for nonlinear photonic applications.
Two-dimensional transition-metal dichalcogenide monolayers have remarkably large optical nonlinearity. However, the nonlinear optical conversion efficiency in monolayer transitionmetal dichalcogenides is typically low due to small light-matter interaction length at the atomic thickness, which significantly obstructs their applications. Here, for the first time, we report broadband (up to similar to 150 nm) enhancement of optical nonlinearity in monolayer MoS2 with plasmonic structures. Substantial enhancement of four-wave mixing is demonstrated with the enhancement factor up to three orders of magnitude for broadband frequency conversion, covering the major visible spectral region. The equivalent third-order nonlinearity of the hybrid MoS2-plasmonic structure is in the order of 10(-17) m(2)/V-2, far superior (similar to 10-100-times larger) to the widely used conventional bulk materials (e.g., LiNbO3, BBO) and nanomaterials (e.g., gold nanofilms). Such a considerable and broadband enhancement arises from the strongly confined electric field in the plasmonic structure, promising for numerous nonlinear photonic applications of two-dimensional materials.
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