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We design a plasmonic fiber waveguide (PFW) composed of coaxial cylindricalmetal-dielectric multilayers in nanoscale, and constitute the correspondingdynamical equations describing the modes of propagation in the PFW with theKerr nonlinearity in the dielectric layers. The physics is connected to thediscrete matrix nonlinear Schr\"{o}dinger equations, from which the highlyconfined ring-like solitons in scale of subwavelength are found both for thevisible light and the near-infrared light in the self-defocusing condition.Moreover, the confinement could be further improved when increasing theintensity of the input light due to the cylindrical symmetry of the PFW, whichmeans both the width and the radius of the ring are reduced.

Ring-Like Solitons in Plasmonic Fiber Waveguide Composed of Metal-Dielectric Multilayers