Actively Tunable Fano Resonance Based on a T-Shaped Graphene Nanodimer

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• 作者：Gui-dong Liu ; Xiang Zhai ; Ling-Ling Wang ; Ben-xin Wang ; Qi Lin…
• 关键词：Fano resonance ; Nanodimer ; Graphene surface plasmons ; Optical sensing
• 刊名：Plasmonics
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：11
• 期：2
• 页码：381-387
• 全文大小：2,364 KB
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• 作者单位：Gui-dong Liu (1)
  Xiang Zhai (1)
  Ling-Ling Wang (1)
  Ben-xin Wang (2)
  Qi Lin (1)
  Xiong-jun Shang (1)
  
  1. School of Physics and Electronics and Key Laboratory for Micro-Nano Physics and Technology of Hunan Province, Hunan University, Changsha, 410082, China
  2. School of Science, Jiangnan University, Wuxi, 214122, China
  
• 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

文摘

We present the strength modulation and frequency tuning of Fano resonance by employing a graphene nanodimer formed by two coplanar perpendicular nanostrips with different dimensions. The Fano resonance is induced by destructive interference between the bright dipole mode of a short nanostrip and the dark quadrupole mode of a long nanostrip. The strength, line width, and resonance frequency of the Fano resonance can be actively modulated by changing the spatial separation of those two graphene nanostrips and the Fermi energy of the graphene nanodimer, respectively, without re-fabricating the nanostructures. The tuning of the strength and resonance frequency can be attributed to the coupling strength and optical properties of graphene, respectively. Importantly, a figure of merit value as high as 39 is achieved in the proposed nanostructures. Our results may provide potential applications in optical switching and bio-chemical sensing.