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Scattering of surface plasmon polaritons by metallic nanostructures.

机译：金属纳米结构对表面等离激元极化子的散射。

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摘要

Surface Plasmons (SPs) which are coherent oscillations of conduction electrons on a metal surface excited by electromagnetic radiation at a metal-dielectric interface have variety of applications in chemistry, optical devices, spectroscopy and bio/chemi sensors. Plasmon scattering is a growing area of importance for nonconventional meta-materials, condensed matter physics, and surface chemistry, thus it is very interested to study. A simulation tool for imaging scattering properties allows ab-initio design for plasmon devices as well as gives better physical insight for experiments. Furthermore, due to the high electric field density associated with SPs, Second-Harmonic Generation (SHG) is expected to be enhanced thus gives us extra physical insights.In this thesis, a simulation tool is developed to calculate the scattering properties of Surface Plasmon Polaritons (SHG) at both fundamental frequency (FF) and second-harmonic (SH). We present a comprehensive study of linear and nonlinear effects observed in the scattering process of surface plasmon polaritons (SPP) from localized surface deformations at a metal/dielectric interface. The electromagnetic field at the fundamental frequency (FF) is first determined by solving the corresponding set of reduced Rayleigh equations. The complete solution of these equations then allows us to investigate both the complex structure of the scattered electromagnetic field as well as the subtle mechanisms by which incident SPPs are scattered into radiative modes (light) and outgoing SPP waves. Furthermore, the electromagnetic field at the FF is used to determine the nonlinear surface polarization at the second harmonic (SH) and subsequently both the electromagnetic field distribution as well as the amount of light generated at the SH. In this thesis, we will discuss our results including the size dependence of the scattering into both surface and radiated waves for several defect shapes as well as the computational issues and the physical phenomena of the scattering process.This thesis is organized as follows. In chapter 1, I will give a brief introduction of SPs as well as their various applications. In chapter 2, the background theories as well as numerical techniques are discussed. Chapter 3 gives us a detailed description of surface SHG from scattering of SPPs by 1D Gaussian metallic nanostructures. Consequently, in chapter 4, the theory is extended to 2D circularly symmetric metallic nanostructures, which include Gaussian, Sphere-cap and Cylinder. Finally in Chapter 5, the some future direction of this thesis work is described.
机译：表面等离激元（SP）是金属表面上的导电电子的相干振荡，在金属-电介质界面处受到电磁辐射的激发，在化学，光学设备，光谱学和生物/化学传感器中具有多种应用。等离子体散射对于非常规超材料，凝聚态物理和表面化学而言，是一个日益重要的领域，因此对它的研究非常感兴趣。用于成像散射特性的仿真工具不仅可以进行等离激元器件的从头设计，还可以为实验提供更好的物理洞察力。此外，由于与SPs相关的高电场密度，有望增强二次谐波产生（SHG），从而为我们提供了更多的物理见解。本文开发了一种仿真工具来计算表面等离激元极化子的散射特性。 （SHG）处于基频（FF）和二次谐波（SH）上。我们对金属/介电界面局部表面形变在表面等离激元极化子（SPP）散射过程中观察到的线性和非线性效应进行了全面研究。首先通过求解相应的简化瑞利方程组来确定基频（FF）处的电磁场。然后，这些方程式的完整解可以让我们研究散射电磁场的复杂结构以及将入射SPP散射成辐射模式（光）和出射SPP波的微妙机制。此外，FF处的电磁场用于确定二次谐波（SH）处的非线性表面极化，并随后确定电磁场分布以及在SH处产生的光量。在本文中，我们将讨论我们的结果，包括对几种缺陷形状的散射到表面波和辐射波中的大小的依赖性，以及散射过程的计算问题和物理现象。本文的结构如下。在第一章中，我将简要介绍SP及其各种应用。在第二章中，讨论了背景理论和数值技术。第三章详细介绍了一维高斯金属纳米结构对SPP的散射所产生的表面SHG。因此，在第4章中，该理论扩展到了2D圆形对称金属纳米结构，包括高斯，球形盖和圆柱体。最后在第五章中，描述了本文工作的未来方向。

著录项

  • 作者

    Cao, Lina.;

  • 作者单位

    Columbia University.;

  • 授予单位 Columbia University.;
  • 学科 Chemistry Physical.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 118 p.
  • 总页数 118
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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