Abstract
Two types of surface plasmon polariton waveguides consisting of square
metal nanowires or nanotubes covered by low-high index dielectric layers are
presented and their guiding characteristics are investigated numerically at
the telecom wavelength of 1550 nm. Numerical analysis reveals that depending
on the sizes of the covered low-high index dielectric layers, the nanowire
based waveguides can be tuned to provide subwavelength confinement of the
plasmonic modes with low propagation loss. Even enhanced optical confinement
could be achieved by further increasing the nanowire size or replacing the
metal nanowires by nanotubes. Consideration of directional coupling between
two identical such plasmonic waveguides reveal ultra-low-crosstalk can be
realized with relatively small separation distances. These waveguiding structures,
compatible with modern fabrication methods, potentially enable the realization
of numerous ultra-compact integrated photonic components.
© 2013 IEEE
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