Kazemi-Zanjani Nastaran, Vedraine Sylvain, Lagugné-Labarthet François
Opt Express. 2013 Oct 21;21(21):25271-6. doi: 10.1364/OE.21.025271.
Finite-Difference Time-Domain (FDTD) calculations are used to characterize the electric field in the vicinity of a sharp silver or gold cone with an apex diameter of 10 nm. The simulations are utilized to predict the intensity and the distribution of the locally enhanced electric field in tip-enhanced Raman spectroscopy (TERS). A side-by-side comparison of the enhanced electric field induced by a radially and a linearly polarized light in both gap-mode and conventional TERS setup is performed. For this purpose, a radially polarized source is introduced and integrated into the FDTD modeling. Additionally, the optical effect of a thin protective layer of alumina on the enhancement of the electric field is investigated.
时域有限差分（FDTD）计算用于表征顶点直径为10纳米的尖锐银或金锥附近的电场。这些模拟用于预测针尖增强拉曼光谱（TERS）中局部增强电场的强度和分布。在间隙模式和传统TERS设置中，对径向偏振光和线性偏振光诱导的增强电场进行了并排比较。为此，引入了径向偏振源并将其集成到FDTD建模中。此外，还研究了氧化铝薄保护层对电场增强的光学效应。
