| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Bright-Dark Mode Coupling Model of Plasmons |
| Jing Zhang1,2, Yong-Gang Xu1,3, Jian-Xin Zhang1, Lu-Lu Guan1, Yong-Fang Li1** |
1School of Physics and Information Technology, Shaanxi Normal University, Xi'an 710119
2School of Electronic Engineering, Xi'an Shiyou University, Xi'an 710065
3School of Science, Xi'an University of Posts and Telecommunications, Xi'an 710121
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| Cite this article: |
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Jing Zhang, Yong-Gang Xu, Jian-Xin Zhang et al 2020 Chin. Phys. Lett. 37 037101 |
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Abstract 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.
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Received: 19 November 2019
Published: 22 February 2020
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| PACS: |
71.45.Gm
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(Exchange, correlation, dielectric and magnetic response functions, plasmons)
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78.67.Bf
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(Nanocrystals, nanoparticles, and nanoclusters)
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75.25.Dk
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(Orbital, charge, and other orders, including coupling of these orders)
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| Fund: Supported by the National Natural Science Foundation of China under Grant No. 11474191, and the Natural Science Foundation of Shaanxi Province under Grant No. 2018JQ1050. |
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