A novel surface plasmon polariton-based waveguide (or called plasmonic waveguide) is proposed to achieve millimeter-scale
propagation distance while maintaining subwavelength mode area. For easy to practically fabricate, the proposed
structure is consisted of a cylinder metallic nanowire bounded by a high-index contrast dielectric material on a low-index
dielectric substrate. The cladding region of the proposed structure is air. To satisfy the index matching condition, we
vary the thickness of the high-index dielectric above the cylinder nanowire. A symmetric mode field profile exhibiting
the lowest resistive loss resulted from the metal is thus obtained to accomplish the low-loss propagation. The proposed
plasmonic waveguide could offer plasmonic circuit interconnects and high-density integrated photonic circuits.
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