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M. Vukovic, Z. Jaksic, J. Matovic:
"Plasmon modes on laminated nanomembrane-based waveguides";
Journal Of Nanophotonics, 4 (2010).

We studied the propagation of plasmonic modes along planar
multilayer metal-dielectric structures with finite number of
bi-layer unit cells. The dispersion relations for various
investigated waveguide structures with the multilayer core and
symmetric or asymmetric cladding have been analyzed. In the
case of symmetric metallic cladding we have found both TE and
TM modes within the light cone, while TM modes only exist
outside the light cone. Both symmetric and asymmetric
dielectric claddings support modes outside the light cone and of
TM-polarization only. Formation of photonic bands and gaps, the
structure of their edge lines, and the behavior of modes that
cross the edge lines has been investigated. In the
subwavelength regime, we have found ordinary surface plasmon
polariton dispersion in the forbidden gap that is created via
coalescence of the two modes that cross the neighboring
band-gap edges. One of those modes can exhibit negative group
velocity.

http://dx.doi.org/10.1117/1.3478229