Enhanced Far-Field Focusing by Plasmonic Lens Under Radially Polarized Beam Illumination

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• 作者：Xiantao Zhang ; Lianshan Yan ; Yinghui Guo ; Wei Pan ; Bin Luo ; Xiangang Luo
• 关键词：Diffraction and gratings ; Subwavelength structures ; Multilayers ; Surface plasmons
• 刊名：Plasmonics
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：11
• 期：1
• 页码：109-115
• 全文大小：1,402 KB
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• 作者单位：Xiantao Zhang (1)
  Lianshan Yan (1)
  Yinghui Guo (1)
  Wei Pan (1)
  Bin Luo (1)
  Xiangang Luo (2)
  
  1. Center for Information Photonics & Communications, School of Information Science & Technology, Southwest Jiaotong University, Chengdu, Sichuan, 610031, China
  2. State Key Lab of Optical Technology for Microfabrication, Institute of Optics and Electronics, Chinese Academy of Science, Chengdu, 610029, 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 plasmonic lens with coupling annular grooves is proposed to achieve enhanced far-field focusing performance. Based on the finite difference time domain (FDTD) method, we demonstrate that a focal beam could be obtained under a radially polarized light illumination. The obtained focal length and working distance range from 3.1 to 3.6 μm and 1.7 to 2.1 μm, respectively. The full-width at half-maximum (FWHM) of the focal spot is about 0.8λ _i and the overall field enhancement factor is improved to be ∼3.9. Keywords Diffraction and gratings Subwavelength structures Multilayers Surface plasmons