Tunable Unidirectional Coupling of Surface Plasmon Polaritons Utilizing a V-Shaped Slot Nanoantenna Column

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• 作者：Feng Huang ; Hanning Yang ; Siren Li ; Xiangqian Jiang ; Xiudong Sun
• 关键词：Surface plasmon polaritons ; Unidirectional coupling ; Polarization ; sensitive nanoantenna ; Plasmon resonant mode
• 刊名：Plasmonics
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：10
• 期：6
• 页码：1825-1831
• 全文大小：6,513 KB
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• 作者单位：Feng Huang (1) (2)
  Hanning Yang (1) (2)
  Siren Li (1) (2)
  Xiangqian Jiang (1) (2)
  Xiudong Sun (1) (2)
  
  1. Department of Physics, Harbin Institute of Technology, Harbin, 150001, China
  2. Key Lab of Micro-Optics and Photonic Technology of Heilongjiang Province, Harbin, 150001, 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

A polarization-sensitive V-shaped slot nanoantenna column is utilized to realize tunable unidirectional coupling of surface plasmon polaritons (SPP). Two plasmon resonant modes are excited in the V-shaped slot nanoantennas with x- and y-polarized incident light, respectively. The electric fields of coupled SPP show different symmetries corresponding to that of the two resonant modes. Linear combinations of the two resonant modes result in asymmetric SPP intensity distributions. As a result, by controlling the incident polarizations, tunable unidirectional coupling of SPP to two opposite directions perpendicular to the column at different wavelengths are realized. A highest extinction ratio of 36.7 dB is achieved, and the extinction ratio keeps larger than 7 dB within a wavelength of 149 nm. Keywords Surface plasmon polaritons Unidirectional coupling Polarization-sensitive nanoantenna Plasmon resonant mode