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Channel SPP modes- channel plasmon
polaritons (CPPs)- are electromagnetic waves that are bound to
and propagate along the bottom of V-shaped grooves milled in a
metal film. They are expected to exhibit useful subwavelength
confinement, relatively low propagation loss, single-mode operation
and efficient transmission around sharp bends.
Here the design, fabrication and characterization
of CPP-based subwavelength waveguide components operating
at telecom wavelengths is reported: Y-splitters, Mach-Zehnder interferometers
and waveguide-ring resonators. We demonstrate that CPP
guides can indeed be used for large-angle bending and splitting of
radiation, thereby enabling the realization of ultracompact plasmonic
components and paving the way for a new class of integrated
optical circuits.
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