Analysis of mode characteristics and output efficiency of graphene equilateral triangle nanocavity with vertex output waveguide

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• 作者：Yixin Huang ; Weibin Qiu ; Shangxin Lin ; Houbo Chen…
• 关键词：Graphene ; Surface plasmon polaritons ; Nanocavity resonator ; Output waveguide ; Directional emission
• 刊名：Optical and Quantum Electronics
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：48
• 期：1
• 全文大小：1,209 KB
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• 作者单位：Yixin Huang (1)
  Weibin Qiu (1)
  Shangxin Lin (1)
  Houbo Chen (1)
  Jia-Xian Wang (1)
  Qiang Kan (2)
  Jiao-Qing Pan (2)
  
  1. College of Information Science and Engineering, Huaqiao University, No. 668, Jimei Avenue, Jimei, Xiamen, 361021, Fujian, China
  2. Institute of Semiconductors, Chinese Academy of Science, No. 35A, Qinghua East Road, Haidian District, Beijing, 100083, China
  
• 刊物主题：Optics, Optoelectronics, Plasmonics and Optical Devices; Electrical Engineering; Characterization and Evaluation of Materials; Computer Communication Networks;
• 出版者：Springer US
• ISSN：1572-817X

文摘

In this paper, we propose and numerically investigate an integrated plasmonic device composed of a graphene monolayer equilateral triangle nanocavity and a cut corner of one vertex which is connected to an output waveguide. This integrated device with a certain chemical potential is surrounded by infinite area of graphene monolayer with another chemical potential. The quality factor (Q factor) and the output efficiency are systematically calculated as function of geometry parameters of the integrated structure and the material parameters of graphene. The simulation results demonstrate that there is a trade-off between the Q factor and the coupling efficiency of the proposed structure. In the integrated plasmonic device with R ₁ of 30 nm and an output width of 5 nm, a Q factor of 80.5 and the corresponding Purcell factor of 4.687 脳 107 are obtained when the chemical potential 渭 _c1 and 渭 _c2 is 0.9 and 0.59 eV respectively. Meanwhile, the output efficiency reaches 20.2 %. The proposed directional emission nanocavity with relatively high output efficiency and relatively high Q factor can be a fundamental structure of the filter or directional emitter in the future plasmonic integrated circuits or transformative plasmonics. Keywords Graphene Surface plasmon polaritons Nanocavity resonator Output waveguide Directional emission