表面等离子体激元
等离子体子
纳米光子学
二次谐波产生
光学
纳米线
表面等离子体子
材料科学
光电子学
偶极子
物理
量子力学
激光器
作者
Yan Li,Mengzhen Kang,Junjun Shi,Ke Wu,Shunping Zhang,Hongxing Xu
出处
期刊:Nano Letters
[American Chemical Society]
日期:2017-11-21
卷期号:17 (12): 7803-7808
被引量:54
标识
DOI:10.1021/acs.nanolett.7b04016
摘要
Coherently adding up signal wave from different locations are a prerequisite for realizing efficient nonlinear optical processes in traditional optical configurations. While nonlinear optical processes in plasmonic waveguides with subwavelength light confinement are in principle desirable for enhancing nonlinear effects, so far it has been difficult to improve the efficiency due to the large momentum mismatch. Here we demonstrate, using remotely excited surface plasmon polaritons (SPPs), axial collimated but transversely divergent second harmonic (SH) generation in a single silver nanowire-monolayer molybdenum disulfide hybrid system. Fourier imaging of the generated SH signal confirms the momentum conservation conditions between the incident and reflected SPPs and reveals distinct features inherent to the 1D plasmonic waveguides: (i) the SH photons are collimated perpendicular to the nanowire axis but are divergent within the perpendicular plane; (ii) the collimation (divergence) is inversely proportional to the length of the active region (lateral confinement of the SPPs); and (iii) the SH emission pattern resembles that of an aligned dipole chain on top of the substrate with an emission peak at the critical angle. Our results pave the way to generate and manipulate SH emission around subwavelength waveguides and open up new possibilities for realizing high efficiency on-chip nonlinear optics.
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