Applied Physics B

, Volume 86, Issue 3, pp 461–466

Influence of V-shaped plasmonic nanostructures on beam propagation

  • Yongqi Fu
  • W. Zhou
  • L.E.N. Lim
  • C. Du
  • H. Shi
  • C. Wang
  • X. Luo
Article

Abstract

The influence of V-shaped plasmonic nanostructures caused by focused ion beam milling on transmission properties are addressed in this paper. In order to evaluate the influence, a finite-difference and time-domain numerical method is employed for simulation of the plasmonic structures flanked with the corrugations with equal groove depth at the exit side of a metal film which is coated on a quartz substrate. Our simulation results have shown that a V-shaped subwavelength central slit/aperture is helpful for beam shaping. It plays a positive and dominant role in transmissivity. However, the V-shaped grooves cause a red shift of the peak wavelength and a broadening of the cut-off wavelength. This leads to the beam diverging in the region of the far field. In the case of the existence of both the V-shaped central slit and the V-shaped grooves, the influence of the grooves is less compared to that of the central slit, and can be ignored theoretically.

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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  • Yongqi Fu
    • 1
  • W. Zhou
    • 1
  • L.E.N. Lim
    • 1
  • C. Du
    • 2
  • H. Shi
    • 2
  • C. Wang
    • 2
  • X. Luo
    • 2
  1. 1.Precision Engineering and Nanotechnology Centre, School of Mechanical and Aerospace EngineeringNanyang Technological UniversitySingaporeSingapore
  2. 2.State Key Laboratory of Optical Technologies for Microfabrication, Institute of Optics and ElectronicsChinese Academy of SciencesChengduP.R. China

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