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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 11 — May. 23, 2011
  • pp: 10073–10087

Investigation of the wave behaviors inside a step-modulated subwavelength metal slit

Chao Li, Yun-Song Zhou, Huai-Yu Wang, and Fu-He Wang  »View Author Affiliations

Optics Express, Vol. 19, Issue 11, pp. 10073-10087 (2011)

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In this paper, we applied the modal expansion method (MEM) to investigate the wave behaviors inside a step-modulated subwavelength metal slit. The physical mechanism of the surface plasmon polariton (SPP) transmission is investigated in detail for slit structures with either dielectric or geometric modulation. The applicability of the effective index method is discussed. Moreover, as a special case of the geometric modulation, the evanescent-wave assisted transmission is demonstrated in a thin-modulated slit. We emphasize that a complete set is necessary in order to expand the wave functions in these kinds of structures. All the calculated results by the MEM are well retrieved by the finite-difference time-domain calculation.

© 2011 OSA

OCIS Codes
(230.7380) Optical devices : Waveguides, channeled
(240.6680) Optics at surfaces : Surface plasmons
(260.3910) Physical optics : Metal optics
(290.5825) Scattering : Scattering theory

ToC Category:
Optics at Surfaces

Original Manuscript: February 23, 2011
Revised Manuscript: April 9, 2011
Manuscript Accepted: April 22, 2011
Published: May 9, 2011

Chao Li, Yun-Song Zhou, Huai-Yu Wang, and Fu-He Wang, "Investigation of the wave behaviors inside a step-modulated subwavelength metal slit," Opt. Express 19, 10073-10087 (2011)

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