Tightly confined plasmon waveguide modes supported by semicircular crosssection top silver nanoridges are investigated in this paper. Mode fieldprofiles, dispersion curves, propagation distances, confinement factors, andfigure-of-merits of semicircular top silver nanoridge plasmon waveguide modeare calculated for different radii of curvature at different wavelengths. It isfound that semicircular top silver nanoridges support tightly confinedquasi-TEM plasmon waveguide modes. Semicircular top silver nanoridge mode haslonger propagation distance and higher figure-of-merit than that of thecylindrical silver nanowire of the same radius of curvature.
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