  Omni-directional light coupling to surface plasmon polariton (SPP) modes to
make use of plasmon mediated near-field enhancement is challenging. We report
possibility of near dispersion-less modes in structures with unpatterned
metal-dielectric interfaces having 2-D dielectric patterns on top. We show that
the position and dispersion of the excited modes can be controlled by the
excitation geometry and the 2-D pattern. The anti-crossings resulting from the
in-plane coupling of different SPP modes are also shown.
