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

Daniel R. Mason | Zendy; Dmitri K. Gramotnev | Zendy; Kwang S. Kim | Zendy

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

Author(s) -

Daniel R. Mason,

Dmitri K. Gramotnev,

Kwang S. Kim

Publication year - 2010

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.18.016139

Subject(s) - optics , wavelength , materials science , transmission (telecommunications) , waveguide , asymmetry , dielectric , surface plasmon , interference (communication) , plasmon , physics , optoelectronics , telecommunications , channel (broadcasting) , quantum mechanics , computer science

In this paper, we present a comprehensive numerical study of the wavelength-dependence of transmission through sharp 90 degrees 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.

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