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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 15 — Jul. 19, 2010
  • pp: 16139–16145

Wavelength-dependent transmission through sharp 90° bends in sub-wavelength metallic slot waveguides

Daniel R. Mason, Dmitri. K. Gramotnev, and Kwang S. Kim  »View Author Affiliations


Optics Express, Vol. 18, Issue 15, pp. 16139-16145 (2010)
http://dx.doi.org/10.1364/OE.18.016139


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Abstract

In this paper, we present a comprehensive numerical study of the wavelength-dependence of transmission through sharp 90° bends in metallic slot waveguides with sub-wavelength localization and varying geometrical parameters. In particular, it is demonstrated that increasing the plasmon wavelength results in a significant increase (up to nearly 100%) of transmission through the bend, combined with a reduction in the mode asymmetry in the second arm of the bend. The mode asymmetry and its relaxation are explained by interference of the transmitted mode with non-propagating and leaky modes generated at the bend. Comparison with the two-dimensional case of a metal-dielectric-metal waveguide is also conducted, showing significant differences for the slot waveguides based on the presence of different non-propagating and leaky modes.

© 2010 OSA

OCIS Codes
(130.0130) Integrated optics : Integrated optics
(130.2790) Integrated optics : Guided waves
(240.0240) Optics at surfaces : Optics at surfaces
(240.6680) Optics at surfaces : Surface plasmons

ToC Category:
Optics at Surfaces

History
Original Manuscript: June 1, 2010
Revised Manuscript: June 28, 2010
Manuscript Accepted: June 29, 2010
Published: July 15, 2010

Citation
Daniel R. Mason, Dmitri. K. Gramotnev, and Kwang S. Kim, "Wavelength-dependent transmission through sharp 90° bends in sub-wavelength metallic slot waveguides," Opt. Express 18, 16139-16145 (2010)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-18-15-16139


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