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Multiple Plasmonic Resonances and Cascade Effect in Asymmetrical Ag Nanowire Homotrimer
Yue Li,GuangTao Fei,Shao-hui Xu,Guo-liang Shang,Hao-miao Ouyang,Li-de Zhang
Author NameAffiliationE-mail
Yue Li 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  
GuangTao Fei 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 gtfei@issp.ac.cn 
Shao-hui Xu 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  
Guo-liang Shang 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  
Hao-miao Ouyang 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  
Li-de Zhang 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.
Key words:  Asymmetric homotrimer  Bright and dark modes  Extinction cross section  Cascade effect
FundProject: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.
非对称Ag纳米线三聚体中的等离体子共振及级联效应
李跃,费广涛,许少辉,商国亮,欧阳浩淼,张立德
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
DOI:10.1063/1674-0068/29/cjcp1602030
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