Bright-Dark Mode Coupling Model of Plasmons  

作　　者：Jing Zhang Yong-Gang Xu Jian-Xin Zhang Lu-Lu Guan Yong-Fang Li 张静;徐永刚;张建鑫;关璐璐;李永放(School of Physics and Information Technology,Shaanxi Normal University,Xi'an 710119;School of Electronic Engineering,Xi'an Shiyou University,Xi'an 710065;School of Science,Xi'an University of Posts and Telecommunications,Xi'an 710121)

机构地区：[1]School of Physics and Information Technology,Shaanxi Normal University,Xi'an 710119 [2]School of Electronic Engineering,Xi'an Shiyou University,Xi'an 710065 [3]School of Science,Xi'an University of Posts and Telecommunications,Xi'an 710121

出　　处：《Chinese Physics Letters》2020年第3期50-54,共5页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant No.11474191;the Natural Science Foundation of Shaanxi Province under Grant No.2018JQ1050。

摘　　要：We propose a coupling model to describe the interaction between the bright and dark modes of the plasmons of a dimer composed of two orthogonal gold nano-rods(GNRs),referred to as the BDMC model.This model shows that the eigen-frequencies of the coupled plasmons are governed by Coulomb potential and electrostatic potential.With the BDMC model,the behaviors of the coupling coefficient and the frequency offset,which is a new parameter introduced here,are revealed.Meanwhile,the asymmetric behavior of two eigen-frequencies related to gap of two GNRs is explained.Using the harmonic oscillator model and the coupled parameters obtained by the BDMC model,the bright mode absorption spectra of the dimer are calculated and the results agree with the numerical simulation.

关 键 词：potential. COUPLING DIMER 

分 类 号：O53[理学—等离子体物理] TN752[理学—物理]