Tunable Localized Hybrid Plasmon Modes and Fano Resonances in Au Core-Semishell

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• 作者：Tengfei Wu ; Shaobo Yang ; Wenbin Tan ; Xingfei Li
• 关键词：Plasmonics ; Symmetry breaking ; Plasmon hybridization ; Fano resonances ; Core ; semishell
• 刊名：Plasmonics
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：11
• 期：5
• 页码：1351-1359
• 全文大小：2,623 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Biotechnology
  Nanotechnology
  Biophysics and Biomedical Physics
  Biochemistry
  
• 出版者：Springer US
• ISSN：1557-1963
• 卷排序：11

文摘

We present a numerical study of the plasmonic properties of Au core-semishell. Symmetry breaking in semishell results in a dipole–quadrupole Fano resonance without the offset of the Au core. The plasmon hybridization theory is applied to interpret the origin of the localized hybrid plasmon modes and Fano resonances. The multiple hybrid plasmon modes resonance can be excited for the extreme core offset inducing high order dark modes visible. The Fano resonances can be tuned by changing the size of the Au core, the degree of symmetry breaking of the semishell, and the dielectric properties of local environment. The tunability of the plasmon resonances and Fano resonances in Au core-semishell provides potential application for tunable nanophotonic devices, such as filters and sensors.