Abstract
We propose and numerically demonstrate a parabolic graded index (GRIN) waveguide for surface-plasmon polaritons (SPPs) allowing subwavelength self-imaging and focusing of SPP waves bound at a metal-dielectric interface. The GRIN structure is applied to design ultracompact multimode-interference devices for SPPs. In particular, a $4\ifmmode\times\else\texttimes\fi{}4$ cross-connect device and an efficient waveguide launcher for dielectric-loaded SPP waveguides are demonstrated by full-wave numerical simulations.
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