Multiple propagating modes of nanowire plasmonics

Abstract

We investigate electromagnetic waves propagating along a metallic wire with a closer look at multiple propagating modes. To this goal, metallic loss is examined for its influence on a hybrid wave. The number of resonance modes is found to strongly depend on the rotational azimuthal mode indices. Based on the highest quality factor, selections are made among the multiple modes. We captured both divisions and mergers of the wave-number extents of the residual functions signifying the nonlinear dispersion relation. In addition, the migrations of the groups of local minima for multiple modes are illustrated from a viewpoint of quasi-temporal evolution. Furthermore, we illustrate collective behaviors of nanowire plasmonics in terms of two constituent waves and their interactions.