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 ...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.展开更多
基金Supported by the National Natural Science Foundation of China under Grant No.11474191the Natural Science Foundation of Shaanxi Province under Grant No.2018JQ1050。
文摘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.
