Phase-matched nonlinear second-harmonic generation in plasmonic metasurfaces
Phase-matched nonlinear second-harmonic generation in plasmonic metasurfaces
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DOI：
10.1515/nanoph-2018-0181
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发表时间：
2019-02
期刊：
影响因子：
7.5
通讯作者：
S. H. Shams Mousavi;R. Lemasters;Feng Wang;A. E. Dorche;H. Taheri;A. Eftekhar;H. Harutyunyan;A. Adibi
中科院分区：
文献类型：
--
作者：
S. H. Shams Mousavi;R. Lemasters;Feng Wang;A. E. Dorche;H. Taheri;A. Eftekhar;H. Harutyunyan;A. Adibi
在宏观晶体中，传播基波与非线性产生波之间的相位匹配对非线性频率转换的效率起着重要作用。然而，在纳米尺度的样品中，如纳米等离子体结构，由于材料的亚波长性质，相位匹配条件往往被忽略。在这里，我们首先证明了等离子体纳米天线阵列中晶格等离子体模式在基频和次谐波频率上的相位匹配可以有效地增强表面增强的二次谐波产生。此外，使用零相位的固定带边晶格等离激元模式可以显著增强二次谐波的产生。
Abstract The phase matching between the propagating fundamental and nonlinearly generated waves plays an important role in the efficiency of the nonlinear frequency conversion in macroscopic crystals. However, in nanoscale samples, such as nanoplasmonic structures, the phase-matching condition is often ignored due to the sub-wavelength nature of the materials. Here, we first show that the phase matching of the lattice plasmon modes at the fundamental and second-harmonic frequencies in a plasmonic nanoantenna array can effectively enhance the surface-enhanced second-harmonic generation. Additionally, a significant enhancement of the second-harmonic generation is demonstrated using stationary band-edge lattice plasmon modes with zero phase.