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arXiv 2009.09557physics.optics
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双曲超结构中最佳场增强增益模式引起的二维材料巨非线性响应

Giant nonlinear response of 2D materials induced by optimal field-enhancement gain mode in hyperbolic meta-structure

Hao-Fei Xu, Ying Yu, Limin Lin, Zhang-Kai Zhou, Xue-Hua Wang

摘要:

超材料中的共振模式已被广泛用于放大实际器件应用中的2D材料的光学响应。然而,谐振模式下的高损耗严重阻碍了超材料的应用。在这里,我们引入一个场增强增益(FEG)的因素,找到FEG模式显着改善光-物质相互作用。作为示范,我们实验比较了单层二硫化钼的二次谐波产生的增强诱导的最佳FEG和双曲元结构中的共振模式。在最佳的FEG模式下,我们获得了22145倍的增强和1.1*10-6 W-1的转换效率,这分别是一个和两个数量级高于以前报道的单层MoS 2。实现了超过~80 nm的宽带高FEG区域,其中非线性增强大于由谐振模式引起的增强。FEG因子的概念对超材料具有普遍意义,为超材料的应用开辟了一条新的途径。

英文摘要:

Resonant modes in metamaterials have been widely utilized to amplify the optical response of 2D materials for practical device applications. However, the high loss at the resonant mode severely hinders metamaterial applications. Here, we introduce a field-enhancement gain (FEG) factor to find the FEG mode for significantly improving light-matter interaction. As a demonstration, we experimentally compared the second harmonic generation enhancement of monolayer MoS2 induced by the optimal FEG and resonant modes in hyperbolic meta-structures. With the optimal FEG mode, we obtained an enhancement of 22145-fold and a conversion efficiency of 1.1*10-6 W-1, which are respectively one and two orders of magnitude higher than that previously reported of monolayer MoS2. A broadband high-FEG region over ~80 nm where the nonlinear enhancement is larger than that induced by the resonant mode is achieved. The concept of FEG factor is general to metamaterials, opening a new way for advancing their applications.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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