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The vector beam assisted “hot-spot” optimization in tip-enhanced Raman spectroscopy
Journal of Raman Spectroscopy ( IF 2.4 ) Pub Date : 2021-08-21 , DOI: 10.1002/jrs.6202 Rong Zhou 1 , Li Chen 2, 3 , Ting Kong 1 , Huan Chen 1 , Zhenglong Zhang 1 , Hao Shen 2, 4 , Hairong Zheng 1
Journal of Raman Spectroscopy ( IF 2.4 ) Pub Date : 2021-08-21 , DOI: 10.1002/jrs.6202 Rong Zhou 1 , Li Chen 2, 3 , Ting Kong 1 , Huan Chen 1 , Zhenglong Zhang 1 , Hao Shen 2, 4 , Hairong Zheng 1
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Tip-enhanced Raman spectroscopy has already promised extremely high plasmonic enhancement due to the successful optical confinement inside the nanocavity or sub-nanocavity between the tip apex and substrate. Yet the dipole-like charge oscillation enabled the gap enhancement, and hence, only the vertical polarization component could match and contribute to the overall efficiency. To avoid the noise and pursuit the mode purity, we chose the vector beam to form a tightly focused vertical electric field to generate such a “hot-spot.” For the bottom illuminated method, taking the opaqueness and absorption characteristics of the beam by the metal substrate into consideration, the substrate thickness becomes the critical factor concerning gap plasmons coupling effect and incident light transmittance. Here, the spatial resolution lines of the vector beam excited from the bottom were compared with that of side method excited by linearly polarized beam, which shows that the vector beam presents greater symmetric characteristics. In addition to better elucidating the mechanism of tip-enhanced Raman spectroscopy, our results can be applied to a rational reference and guidance for later experiments.
中文翻译：
矢量光束辅助尖端增强拉曼光谱中的“热点”优化
由于纳米腔内或尖端和基底之间的亚纳米腔内的成功光学限制，尖端增强拉曼光谱已经承诺极高的等离子体增强。然而，类似偶极子的电荷振荡使间隙增强成为可能，因此，只有垂直极化分量可以匹配并有助于整体效率。为了避免噪声和追求模式纯度，我们选择了矢量光束形成一个紧密聚焦的垂直电场来产生这样一个“热点”。对于底部照明方法，考虑到金属基板对光束的不透明性和吸收特性，基板厚度成为影响间隙等离子体耦合效应和入射光透射率的关键因素。这里，从底部激发的矢量束的空间分辨率线与线偏振束激发的侧向法的空间分辨率线进行了比较，表明矢量束呈现出更大的对称特性。除了更好地阐明尖端增强拉曼光谱的机理外，我们的结果还可以为以后的实验提供合理的参考和指导。
更新日期：2021-10-13
中文翻译：
矢量光束辅助尖端增强拉曼光谱中的“热点”优化
由于纳米腔内或尖端和基底之间的亚纳米腔内的成功光学限制，尖端增强拉曼光谱已经承诺极高的等离子体增强。然而，类似偶极子的电荷振荡使间隙增强成为可能，因此，只有垂直极化分量可以匹配并有助于整体效率。为了避免噪声和追求模式纯度，我们选择了矢量光束形成一个紧密聚焦的垂直电场来产生这样一个“热点”。对于底部照明方法，考虑到金属基板对光束的不透明性和吸收特性，基板厚度成为影响间隙等离子体耦合效应和入射光透射率的关键因素。这里，从底部激发的矢量束的空间分辨率线与线偏振束激发的侧向法的空间分辨率线进行了比较，表明矢量束呈现出更大的对称特性。除了更好地阐明尖端增强拉曼光谱的机理外，我们的结果还可以为以后的实验提供合理的参考和指导。
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