Asymmetrical excitation of surface plasmon polaritons on blazed gratings at normal incidence

  • Bai, Benfeng
  • Meng, Xiangfeng
  • Laukkanen, Janne
  • Sfez, Tristan
  • Yu, Libo
  • Nakagawa, Wataru
  • Herzig, Hans Peter
  • Li, Lifeng
  • Turunen, Jari
Publication date
July 2009
Publisher
American Physical Society (APS)

Abstract

We present results of numerical simulations and preliminary experiments to investigate and characterize the effect of asymmetrical coupling of normally incident light to surface plasmon polaritons (SPPs) on metallic blazed gratings. Two types of blazed gratings are investigated, a two-dimensional (2D) area-coded binary grating and a one-dimensional (1D) slanted sinusoidal grating. The 2D blazed grating, which can be fabricated with standard e-beam lithography, is shown to have the same ability as the classical 1D blazed grating to enhance the strength of the −1st(+1st) evanescent order over the +1st(−1st) counterpart, which leads to the asymmetrical excitation of two counterpropagating SPP modes on the grating surface. The 1D blazed grating...

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