Propagation mechanism of surface plasmons coupled with surface-enhanced resonant Raman scattering light through a one-dimensional hotspot along a silver nanowire dimer junction
Propagation mechanism of surface plasmons coupled with surface-enhanced resonant Raman scattering light through a one-dimensional hotspot along a silver nanowire dimer junction
复制标题
表面等离子体激元与表面增强共振拉曼散射光耦合通过沿着银纳米线二聚体结的一维热点的传播机制
DOI：
10.1103/physrevb.103.245425
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发表时间：
2021
影响因子：
3.7
通讯作者：
Balachandran Jeyadevan
中科院分区：
文献类型：
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作者：
Itoh Tamitake;Yamamoto Yuko S.;Balachandran Jeyadevan
我们研究了表面增强共振拉曼散射(SerRS)光与表面等离子体激元(SP)耦合的几个微米范围内通过位于等离子体纳米线二聚体(NWD)之间的一维热点(1DHS)的端型激发。它的传播特性包括：与一维HS长轴垂直的激发和探测极化引起的有效传播，传播轮廓由明亮的短传播和暗的长传播组成，SERRS谱形状与NWD的局域等离子体激元(LP)共振无关，SERRS谱在一维HSS的边缘红移，传播长度出现相当大的NWD到NWD的变化。基于电磁学的数值计算很好地再现了这些性质。这些计算揭示了如下的传输机制：激发光在一维HSS的边缘与LP共振耦合，光能被转移到支持短传播和长传播的两种结SP模，这些模被归因于耦合的双SP模的上、下分支。这一机制全面阐明了上述性质。
We investigate the propagation of surface-enhanced resonant Raman scattering (SERRS) light coupled with surface plasmons (SPs) by several micrometers through a one-dimensional hotspot (1D HS) located between a plasmonic nanowire dimer (NWD) by end-type excitations. The propagation exhibits properties, e.g., an effective propagation is induced by excitation and detection polarization orthogonal to the 1D HS long axis, the propagation profiles are composed of bright short and dark long propagations, SERRS spectral shapes are independent of localized plasmon (LP) resonance of NWDs, the SERRS spectra redshifts at the edges of 1D HSs, and considerable NWD-by-NWD variations appear in the propagation lengths. These properties are well reproduced by numerical calculations based on electromagnetism. These calculations reveal the following propagation mechanism: excitation light resonantly coupled with LP at the edges of 1D HSs, and the light energy is transferred to two types of junction SP modes supporting the short and long propagations; these modes are attributed to the upper and lower branches of coupled two-SP modes. This mechanism comprehensively clarifies the abovementioned properties.