Abstract
Propagating two-dimensional plasmon polariton modes guided by elliptical
cross section silver nanoridges are investigated in this paper. Mode field
profiles, dispersion curves, propagation distances, and figure-of-merits of
the plasmon modes are calculated for various elliptical cross section silver
nanoridges. It is found that the elliptical cross section metal nanoridge,
if designed properly, can support a tightly confined plasmon mode with a longer
propagation distance and a higher figure-of-merit than the flat-top nanoridge
waveguide of the same width. The optimal nanoridge waveguide is obtained when
the elliptical waveguide cross section becomes a semicircular cross section.
When the curvature of the elliptical nanoridge is large, the nanoridge plasmon
mode approaches the wedge plasmon mode.
© 2012 IEEE
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