论文标题
偶极四极耦合等离子体共振，表面增强的共振拉曼与远场散射之间的光谱相关性
Spectral correlation between surface-enhanced resonant Raman and far field scattering destructed by dipole quadrupole coupled plasmon resonance
论文作者
论文摘要
使用单个银纳米粒子二聚体研究了表面增强的共振拉曼散射（SERR）和等离子体共振之间的光谱关系，其中重点是最低能量（超级）等离子体共振。我们发现这些关系可以分为两种类型。第一个是SERRS光谱信封，其光谱形状类似于等离子体共振光谱。第二个是从等离子体共振光谱中表现出较高能量转移的SERR信封。这些结果被检查为基于电磁（EM）机制的二聚体形态不对称程度的影响。对第一类和第二种类型的分析表明，偶极 - 偶极子和偶极 - Quplepole耦合的等离子体共振（次级FANO共振）分别确定了EM增强。该机制通常对于各种表面增强光谱镜的等离激元纳米结构的开发至关重要。
The spectral relationships between surface enhanced resonant Raman scattering (SERRS) and plasmon resonance observed in far field scattering cross are investigated using single silver nanoparticle dimers with focusing on the lowest energy (superradiant) plasmon resonance. We find that these relationships can be classified into two types. The first is SERRS spectral envelopes with spectral shapes similar to those of plasmon resonance spectra. The second is SERRS envelopes exhibiting higher energy shifts from the plasmon resonance spectra. These results are examined as an effect of degree of morphological asymmetry in dimers based on an electromagnetic (EM) mechanism. The analysis of the first and second types reveals that dipole-dipole and dipole-quadrupole coupled plasmon resonance (subradiant Fano resonance) respectively determine the EM enhancement. This mechanism is commonly important for the development of plasmonic nanostructures for various surface enhanced spectroscopies.
