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非对称Ag纳米线三聚体中的等离体子共振及级联效应
引用本文:李跃,费广涛,许少辉,商国亮,欧阳浩淼,张立德.非对称Ag纳米线三聚体中的等离体子共振及级联效应[J].化学物理学报,2016,29(4):489-496.
作者姓名:李跃  费广涛  许少辉  商国亮  欧阳浩淼  张立德
作者单位:中国科学院合肥物质科学研究院固体物理研究所, 中国科学院材料物理重点实验室, 安徽纳米材料与技术重点实验室, 合肥 230031,中国科学院合肥物质科学研究院固体物理研究所, 中国科学院材料物理重点实验室, 安徽纳米材料与技术重点实验室, 合肥 230031,中国科学院合肥物质科学研究院固体物理研究所, 中国科学院材料物理重点实验室, 安徽纳米材料与技术重点实验室, 合肥 230031,中国科学院合肥物质科学研究院固体物理研究所, 中国科学院材料物理重点实验室, 安徽纳米材料与技术重点实验室, 合肥 230031,中国科学院合肥物质科学研究院固体物理研究所, 中国科学院材料物理重点实验室, 安徽纳米材料与技术重点实验室, 合肥 230031,中国科学院合肥物质科学研究院固体物理研究所, 中国科学院材料物理重点实验室, 安徽纳米材料与技术重点实验室, 合肥 230031
基金项目:This work was supported by the National Basic Research Program of China (No.2012CB932303), the National Natural Science Foundation of China (No.51171176, No.51471162, and No.11204307), and the CAS/SAFEA International Partnership Program for Creative Research Teams.
摘    要:本文采用二维有限元方法,研究了由非对称半径及间距组成的银纳米线三聚体的等离子体共振以及异常的电场分布现象. 模拟结果显示,非对称银纳米线三聚体中存在亮模和暗模. 当亮模分布于两根半径较小的纳米线之间时,会导致在较大半径的两根纳米线间出现较高的场增强分布,说明级联效应被抑制. 相反,当两根半径较小的纳米线之间存在暗模时,较大的场增强存在于两根较小半径的纳米线间,此时所产生的级联效应得以实现.

关 键 词:非对称三聚体  暗模和亮模  消光光谱  级联效应
收稿时间:2016/2/26 0:00:00
修稿时间:2016/3/22 0:00:00

Multiple Plasmonic Resonances and Cascade Effect in Asymmetrical Ag Nanowire Homotrimer
Yue Li,GuangTao Fei,Shao-hui Xu,Guo-liang Shang,Hao-miao Ouyang and Li-de Zhang.Multiple Plasmonic Resonances and Cascade Effect in Asymmetrical Ag Nanowire Homotrimer[J].Chinese Journal of Chemical Physics,2016,29(4):489-496.
Authors:Yue Li  GuangTao Fei  Shao-hui Xu  Guo-liang Shang  Hao-miao Ouyang and Li-de Zhang
Institution:Key Laboratory of Materials Physics, and Anhui Key Laboratory of Nanomaterials and Nanotechnology, Institute of Solid State Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China,Key Laboratory of Materials Physics, and Anhui Key Laboratory of Nanomaterials and Nanotechnology, Institute of Solid State Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China,Key Laboratory of Materials Physics, and Anhui Key Laboratory of Nanomaterials and Nanotechnology, Institute of Solid State Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China,Key Laboratory of Materials Physics, and Anhui Key Laboratory of Nanomaterials and Nanotechnology, Institute of Solid State Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China,Key Laboratory of Materials Physics, and Anhui Key Laboratory of Nanomaterials and Nanotechnology, Institute of Solid State Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China and Key Laboratory of Materials Physics, and Anhui Key Laboratory of Nanomaterials and Nanotechnology, Institute of Solid State Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China
Abstract:Plasmonic Ag nanowire homotrimer with asymmetrical radii and separations, which exhibits characteristics of multiple plamonic resonances and different electric fleld distributions, is systematically investigated by means of 2D flnite element method. It was found that the dark and bright modes appear in asymmetrical nanowire homotrimer. In addition, when the dark modes appear between the smaller radii of the nanowires, the cascade effect results in enhanced electric fleld between the smaller radii nanowires. As a result of the appearance of the bright modes between the smaller radii of the nanowires, the restriction of the cascade effect generates enhanced electric fleld between the bigger nanowires.
Keywords:Asymmetric homotrimer  Bright and dark modes  Extinction cross section  Cascade effect
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