Institute of Physical Chemistry, Friedrich-Schiller-University Jena, Helmholtzweg 4, 07743 Jena, Germany.
Chemphyschem. 2010 Jun 21;11(9):1918-24. doi: 10.1002/cphc.200901009.
In general, the electromagnetic mechanism is understood as the strongest contribution to the overall surface-enhanced Raman spectroscopy (SERS) enhancement. Due to the excitation of surface plasmons, a strong electromagnetic field is induced at the interfaces of a metallic nanoparticle leading to a drastic enhancement of the Raman scattering cross-section. Furthermore, the Raman scattered light expierences an emission enhancement due to the plasmon resonances of the nanoantennas. Herein, this second part of the electromagnetic enhancement phenomenon is investigated for different Raman bands of crystal violet by utilizing the anisotropic plasmonic character of gold nanorhomb SERS arrays. We aim at evaluating the effects of localized and propagating surface plasmon polariton modes as well as their combination on the scattered SERS intensity. From that point of view, design and fabrication strategies towards the fabrication of SERS arrays for excitation wavelengths in the visible and near-infrared (NIR) spectral region can be given, also using a double-resonant electromagnetic enhancement.
一般来说，电磁机制被理解为对整体表面增强拉曼光谱（SERS）增强的最强贡献。由于表面等离激元的激发，在金属纳米粒子的界面处诱导出强电磁场，导致拉曼散射截面的急剧增强。此外，由于纳米天线的等离子体共振，拉曼散射光经历了发射增强。在此，通过利用金纳米棒 SERS 阵列的各向异性等离子体特性，研究了不同拉曼带的晶体紫的电磁增强现象的第二部分。我们旨在评估局域和传播表面等离激元模式及其组合对散射 SERS 强度的影响。从这个角度来看，可以给出用于可见光和近红外（NIR）光谱区域激发波长的 SERS 阵列的设计和制造策略，同时还利用双共振电磁增强。
