, Volume 14, Issue 6, pp 1593–1599 | Cite as

Nanofocusing of Surface Plasmon Polaritons on Metal-Coated Fiber Tip Under Internal Excitation of Radial Vector Beam

  • Fanfan Lu
  • Wending ZhangEmail author
  • Lu Zhang
  • Min Liu
  • Tianyang Xue
  • Ligang Huang
  • Feng Gao
  • Ting MeiEmail author


We theoretically present the nanofocusing of the metal-coated fiber tip under internal excitation of the radial vector beam within visible band based on the finite difference time domain (FDTD) analysis. The electric field intensity enhancement factor of the localized surface plasmons (LSP) mode at the tip apex is quantitatively shown in relation with incident wavelength, coating material, conical angle of tip, and coating film thickness/length. Specially, the evolution of fiber radial vector mode to surface mode with respect to the radius of metal-coated fiber tip is calculated under typical excitation wavelengths of 633 nm and 785 nm. Furthermore, the reason of the tip eliminating far-field background signal is explained, and the transverse electric field distributions of LSP mode and the tip-substrate coupling are also given at the optimal excitation wavelength. These calculation results will be a good reference for the fabrication of metal-coated fiber tips and for the experimental design of the tip-enhanced spectroscopy (TES) system.


Surface plasmon polaritons Plasmonic nanofocusing Electric field enhancement Fiber optics Finite difference time domain (FDTD) 


Funding Information

This work was financially supported by the National Natural Science Foundation of China (61675169, 61675171) and Natural Science Basic Research Plan in Shaanxi Province of China (2018JM6036, 2018KW-009).


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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions and Shaanxi Key Laboratory of Optical Information Technology, School of ScienceNorthwestern Polytechnical UniversityXi’anChina
  2. 2.Key Laboratory of Optoelectronic Technology and Systems (Ministry of Education)Chongqing UniversityChongqingChina
  3. 3.MOE Key Laboratory of Weak-Light Nonlinear Photonics, TEDA Applied Physics Institute and School of PhysicsNankai UniversityTianjinChina

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