基于纳米粒子链的表面等离子体的数值模拟

从电磁基本理论出发,深入研究了金膜上基于纳米粒子抛物链的表面等离子体的相互作用,由并矢格林函数求解波动方程,建立分层参考系统的电磁场模型.将纳米粒子抛物链划分为一系列立方单元,并利用耦合偶极子法将该积分方程转化为矩阵方程,从而计算出空间任意点的电场.此外,还给出了计算实例,并与国外的结果进行分析对比,证明运用的计算方法结果正确,算法快速.

Numerical Modeling on Surface Plasmon Polaritons by Curved Chains of Nanoparticles

Excitation,focusing and directing of surface plasmon polaritons(SPPs) with curved chains of nanoparticles located on a finite gold layer are investigated theoretically.The theory of Green’s dyadic functions on a layered reference system is outlined and electromagnetic properties of surface plasmons are discussed.A curved chain of nanoparticles in upper half-space is divided into a number of cubic cells and the integral equation is reduced to a matrix equation using coupled dipole formalism.Then the electric fields at any point is calculated on gold surface.Numerical simulations of the configuration investigated experimentally are carried out based on the Green’s tensor formalism and dipole approximation.The numerical result show excellent agreement with foreign works.