Fano Resonances Induced by Strong Interactions Between Dipole and Multipole Plasmons in T-Shaped Nanorod Dimer

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• 作者：Yun Binfeng (1)
  Hu Guohua (1)
  Cong Jiawei (1)
  Cui Yiping (1)
  
• 关键词：Surface plasmon ; Fano resonance ; Dimer ; Multipole
• 刊名：Plasmonics
• 出版年：2014
• 出版时间：June 2014
• 年：2014
• 卷：9
• 期：3
• 页码：691-698
• 全文大小：
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• 作者单位：Yun Binfeng (1)
  Hu Guohua (1)
  Cong Jiawei (1)
  Cui Yiping (1)
  
  1. Advanced Photonics Center, Southeast University, Nanjing, China, 210096
  
• ISSN：1557-1963

文摘

A simple T-shaped plasmonic nanostructure composed of two perpendicular coupled nanorods is proposed to produce strong Fano resonances. By the near-field coupling between the “bright-dipole and “dark-quadrupole plasmons of the nanorods, a deep Fano dip is formed in the extinction spectrum, which can be well fitted by the Fano interference model. The effects of the geometry parameters including nanorod length, coupling gap size, and coupling location to the Fano resonances are analyzed in detail, and a very high refractive index sensitivity is achieved by the Fano resonance. Also by adjusting the incident polarization direction, double Fano resonances can be formed by the interferences of the dipole, quadrupole, and hexapole plasmons. The proposed nanorod dimer structure is agile, and a trimer which supports double Fano resonances can be easily formed by introducing a third perpendicular coupled nanorod. The proposed T-shaped nanorod dimer structure may have applications in the fields of biological sensing and plasmon-induced transparency.