An Integrated Multistage Nanofocusing System

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• 作者：Jiannong Chen (1)
  Linwei Zhu (1)
  Feifei Wang (1)
  Wangzi Ma (1)
  
• 关键词：Nanofocusing ; Multistage ; Surface plasmonic lens ; Radially polarized beam ; Hybrid
• 刊名：Plasmonics
• 出版年：2013
• 出版时间：December 2013
• 年：2013
• 卷：8
• 期：4
• 页码：1559-1565
• 全文大小：
• 作者单位：Jiannong Chen (1)
  Linwei Zhu (1)
  Feifei Wang (1)
  Wangzi Ma (1)
  
  1. School of Physics and Optoelectronic Engineering, Ludong University, 264025, Yantai, China
  
• ISSN：1557-1963

文摘

We demonstrate an integrated multistage nanofocusing system which combines a conventional objective, a surface plasmonic lens, and a center-positioned rounded-tip cone nanoparticle. The surface plasmonic lens, fabricated on the cover glass which has been mounted on the biological microscopic objective, is composed of several concentric annular slits for exciting propagating surface plasmonic wave. The rounded-tip cone nanoparticle is for further generating non-propagating localized surface plasmonic wave. It is revealed that the enhancement of the nanoscale optical field can be improved by carefully choosing the appropriate numerical aperture of the objective to match the specific nanostructure of the surface plasmonic lens and choosing the relatively big cone angle of the nanoparticle. The investigation shows that a highly confined electric field as small as 20?nm and an enhancement factor of 5 orders of magnitude can be achieved through this multistage nanofocusing system when the system is illuminated with a uniform radially polarized beam.