镜腔弯曲等离子体纳米线的弹性光束和SERS辐射
Beaming Elastic and SERS Emission from Bent-Plasmonic Nanowire on a Mirror Cavity
摘要：
本文报道了在反射镜腔上的纳米线（B-NWoM）的弹性发射和表面增强拉曼散射（SERS）发射的实验观察。利用偏振分辨傅立叶平面和能量动量成像对系统进行探测，以研究发射波矢量的光谱和角度特征。来自扭结的耦合出的弹性散射光占据窄的角展度。我们使用具有明确分子取向的分子的自组装单层来利用腔中的面外电场来增强来自分子的拉曼发射并实现成束SERS发射。弹性散射和SERS发射的计算方向性分别为16.2和12.5分贝。实验数据与三维数值有限元和基于时域有限差分的数值模拟相印证。这里提出的结果可能会发现相关的理解发射器与细长等离子体腔的耦合和设计片上光学天线。
英文摘要：
We report on the experimental observation of beaming elastic and surface enhanced Raman scattering (SERS) emission from a bent-nanowire on a mirror (B-NWoM) cavity. The system was probed with polarization resolved Fourier plane and energy-momentum imaging to study the spectral and angular signature of the emission wavevectors. The out-coupled elastically scattered light from the kink occupies a narrow angular spread. We used a self-assembled monolayer of molecules with a well-defined molecular orientation to utilize the out-of-plane electric field in the cavity for enhancing Raman emission from the molecules and in achieving beaming SERS emission. Calculated directionality for elastic scattering and SERS emission were found to be 16.2 and 12.5 dB respectively. The experimental data were corroborated with three-dimensional numerical finite element and finite difference time domain based numerical simulations. The results presented here may find relevance in understanding coupling of emitters with elongated plasmonic cavities and in designing on-chip optical antennas.
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