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Hybrid Three-Dimensional Spiral WSe2 Plasmonic Structures for Highly Efficient Second-Order Nonlinear Parametric Processes

查看全文 作　　者：Xianqing [1,2]Lin;Yingying [1,2]Liu;Kang [1,2]Wang;Xiaolong [1,2]Liu;Yongli [1,2]Yan;Yong Jun [1,2]Li;Jiannian [1,2]Yao;Yong Sheng [1,2]Zhao 高影响力作者 机构地区：[1]Key Laboratory of Photochemistry,Institute of Chemistry,Chinese Academy of Sciences,Beijing 100190,China;[2]University of Chinese Academy of Sciences,Beijing 100049,China高影响力机构 出　　处：《Research》索引2018年第1期,共8页高影响力期刊 基　　金：Tis work was supported fnancially by the Ministry of Science and Technology of China[Grant Nos.2017YFA0204502 and 2015CB932404];the National Natural Science Foundation of China[Grant Nos.21773265,21533013,and 21790364];and the Youth Innovation Promotion Association CAS[2014028]. 摘　　要：Two-dimensional(2D)layered materials,with large second-order nonlinear susceptibility,are currently growing as an ideal candidate for fulflling tunable nanoscale coherent light through the second-order nonlinear optical parametric processes.However,the atomic thickness of 2D layered materials leads to poor feld confnement and weak light-matter interaction at nanoscale,resulting in low nonlinear conversion efciency.Here,hybrid three-dimensional(3D)spiral WSe2 plasmonic structures are fabricated for highly efcient second harmonic generation(SHG)and sum-frequency generation(SFG)based on the enhanced light-matter interaction in hybrid plasmonic structures.Te 3D spiral WSe2,with AA lattice stacking,exhibits efcient SH radiation due to the constructive interference of nonlinear polarization between the neighboring atomic layers.Tus,extremely high external SHG conversion efciency(about 2.437×10−5)is achieved.Moreover,the ease of phase-matching condition combined with the enhanced light-matter interaction in hybrid plasmonic structure brings about efcient SHG and SFG simultaneously.Tese results would provide enlightenment for the construction of typical structures for efcient nonlinear processes. 关 键 词：NONLINEAR LAYERED Highly
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