Deep-subwavelength Guiding and Superfocusing of Spoof Surface Plasmon Polaritons on Helically Grooved Metal Wire

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• 作者：Liangliang Liu ; Zhuo Li ; Pingping Ning ; Bingzheng Xu ; Chen Chen ; Jia Xu…
• 关键词：Spoof surface plasmon polaritons ; Mode conversion ; Helically grooved metal wire ; Superfocusing
• 刊名：Plasmonics
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：11
• 期：2
• 页码：359-364
• 全文大小：1,290 KB
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• 作者单位：Liangliang Liu (1)
  Zhuo Li (1) (2)
  Pingping Ning (1)
  Bingzheng Xu (1)
  Chen Chen (1)
  Jia Xu (1)
  Xinlei Chen (1)
  Changqing Gu (1)
  
  1. Key Laboratory of Radar Imaging and Microwave Photonics, Ministry of Education, College of Electronic and Information Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China
  2. State Key Laboratory of Millimeter Waves, Southeast University, Nanjing, 210096, 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

Deep-subwavelength guiding and superfocusing of spoof surface plasmon polaritons (SSPPs) realized on a helically grooved metal wire at microwave frequencies are presented in this paper. Two smooth bridges with gradient helical grooves decorated on the cylindrical and conical metal wire are proposed and designed, respectively. High-efficiency and broadband mode conversion from the traditional guided waves to the SSPPs and superfocusing of SSPPs are reported. Numerical simulations quantitatively show that the amplitudes of electric field at the tip of the conical wire with gradient helical grooves can be magnified 50 times more than that of the input signal in broadband. Moreover, the second transition structure ensures that the depth of helical groove can be tuned flexibly and arbitrarily, making it compatible with all kinds of N-type coaxial connectors. Strong field concentration and superfocusing of these two structures can be easily extended to terahertz (THz) frequencies by tuning the geometrical parameters and can find important applications in sensing, spectroscopy and near-field imaging in the microwave and THz frequencies.