Centrally Symmetric Focusing of Surface Plasmon Polaritons with a Rectangular Holes Arrayed Plasmonic Lens

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• 作者：Feng Huang ; Xiangqian Jiang ; Haiming Yuan ; Siren Li ; Hanning Yang…
• 关键词：Surface plasmon polaritons ; Plasmonic lens ; Polarization selective devices ; Nanostructures
• 刊名：Plasmonics
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：11
• 期：6
• 页码：1637-1643
• 全文大小：3,051 KB
• 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
• 卷排序：11

文摘

Nano rectangular holes etched in a gold thin film are optimized and arrayed to form a plasmonic lens. We demonstrate both theoretically and numerically that the proposed plasmonic lens can focus surface plasmon polaritons to a centrally symmetric field with spatially homogeneous arbitrary polarization incidence, including linear, elliptical, and circular polarization incidence. Centrally symmetric field distributions with highly confined spots whose size beyond the diffraction limit are achieved. Particularly, the intensity distribution of the focused field is insensitive to the polarization direction of linearly polarized incident light and the inclination angle of elliptically polarized incident light. Moreover, the intensity of the focal spot can be modulated by the ellipticity angle of elliptically polarized incident light. The intensity is maximized for right-handed circular polarization incidence, and is twice that for linear polarization incidence, while that is null for left-handed circular polarization incidence.