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Studies on Near-field Coupling Effects of Metal Nanoparticles and Applications of Discrete Dipole Approximation

Abstract

金属纳米粒子间的近场耦合效应对其远场光学和近场分布都有着巨大影响,它是形成表面增强拉曼散射(SERS)的增强“热点”的关键因素。本论文的中心工作是从理论上定量研究球形及非球形金属纳米粒子二聚体的线性光学性质和它们在SERS应用中的电磁场增强机理。 本文首先利用广义米氏散射理论(GeneralizedMie)系统研究了球形钯、银等纳米粒子二聚体的线性光学性质及其SERS增强效应。计算表明,粒子间的近场耦合效应对粒子对的吸收、散射和消光光谱影响显著,表面等离子体激元共振峰的位置随粒子间隔的变小而显著红移。在耦合效应和尺寸效应的共同作用下,钯纳米粒子二聚体的表面平均SERS增强因子可达105~10...The near-field coupling effect of metal nanoparticles has great influence on the far field spectra and the near field distributions, particularly on the enhanced ‘hot spot’ for the surface-enhanced Raman scattering (SERS). The main focus of this thesis is to theoretically study the quantitative dependence of the linear optical properties and electromagnetic (EM) enhancement mechanism. The linear ...学位:理学硕士院系专业:物理与机电工程学院物理学系_光学学号:1982007115230

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