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We investigate surface modes in plasmonic Bragg fibers composed ofnanostructured coaxial cylindrical metal-dielectric multilayers. We demonstratethat the existence of surface modes is determined by the sign of the spatiallyaveraged permittivity of the plasmonic Bragg fiber, $\bar{% \varepsilon}$.Specifically, localized surface modes occur at the interface between thecylindrical core with $\bar{\varepsilon}<0$ and the outermost uniformdielectric medium, which is similar to the topologically protected plasmonicsurface modes at the interface between two different one-dimensional planarmetal-dielectric lattices with opposite signs of the averaged permittivity.Moreover, when increasing the number of dielectric-metal rings, the propagationconstant of surface modes with different azimuthal mode numbers is approachingthat of surface plasmon polaritons formed at the corresponding planarmetal/dielectric interface. Robustness of such surface modes of plasmonic Braggfibers is demonstrated too.

Surface modes in plasmonic Bragg fibers with negative average permittivity