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Study of Surface Plasmon Resonance in Metal and Alloy Nanofilms using Maxwell Description and Metamaterial Simulation in COMSOL.

机译:使用Maxwell描述和COMSOL中的超材料模拟研究金属和合金纳米膜中的表面等离子体共振。

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摘要

Metamaterials are artificial metallic structures having, possibly, simultaneously negative permittivity and negative permeability which is called a double negative medium. To achieve a visible light range of the metamaterial, the unit cell of the metamaterial units should be 10-200nm. It is a much bigger structure than a size of normal atom. Still, the resolution of fabrication, which is difficult part, should typically be a few nanometers to achieve a nano-level unit.;We study Ag thin-film as a convenient candidate for metamaterial over a specific frequency range. Because, the thin film metal is composed of disk shape island structures itself. These represent be each metamaterial unit cell. To model the metamaterial model for each thickness of silver, we use surface plasmon-polaritons which is called SPPs. It can coupled Prism and metal to check where is plasmon resonance angle. This specific angle and the reflectivity of a thin silver film are function of metal and dielectric of thickness and metal's permittivity and dielectric function of layer. Experimental measurements of SPPs and Simon's simulation show good agreement with the COMSOL Multiphysics metamaterial model. And we demonstrate the annealing method for a thin film metal is nice approach to change the surface plasmon resonance angle. The theory of SPPs is explained using the Drude model and Maxwell equation.
机译:超材料是可能同时具有负介电常数和负磁导率的人造金属结构,称为双重负介质。为了获得超材料的可见光范围,超材料单元的晶胞应为10-200nm。它比正常原子的大小大得多。尽管如此,制造的分辨率(这是很困难的部分)通常应达到几纳米才能达到纳米级。我们研究了Ag薄膜作为超材料在特定频率范围内的方便候选者。因为,薄膜金属本身由盘形岛结构组成。这些代表每个超材料单元格。为了模拟每种厚度的银的超材料模型,我们使用表面等离振子-极化子,称为SPP。它可以耦合棱镜和金属来检查等离子共振角在哪里。银膜的该比角和反射率是金属和厚度的电介质的函数以及层的金属介电常数和电介质的函数。 SPP的实验测量和Simon的仿真显示与COMSOL Multiphysics超材料模型具有很好的一致性。并证明了薄膜金属的退火方法是改变表面等离子体激元共振角的一种很好的方法。使用Drude模型和Maxwell方程解释了SPP的理论。

著录项

  • 作者

    Park, Heesoo.;

  • 作者单位

    Rose Hulman Institute of Technology.;

  • 授予单位 Rose Hulman Institute of Technology.;
  • 学科 Optics.
  • 学位 M.S.
  • 年度 2015
  • 页码 92 p.
  • 总页数 92
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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