Abstract
The formations of the surface plasmon polariton (SPP) bands in
metal/air/metal (MAM) sub-wavelength plasmonic grating waveguide (PGW) are
proposed. The band gaps originating from the highly localized resonances
inside the grooves can be simply estimated from the round trip phase
condition. Due to the overlap of the localized SPPs between the neighboring
grooves, a Bloch mode forms in the bandgap and can be engineered to build a
very flat dispersion for slow light. A chirped PGW with groove depth varying
is also demonstrated to trap light, which is validated by finite-difference
time-domain (FDTD) simulations with both continuous and pulse
excitations.
© 2010 IEEE
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