Mode Hopping in 1D Arrays of Resonant PEC Thin Wires over an Interface between Two Dielectric Media

Guided localized electromagnetic waves propagating along 1D arrays of thin metallic parallel wires, finite and infinite, are studied. The array of thin PEC wires is embedded in the upper dielectric half-space close to the interface separating two dielectric media with different permittivities. In the first part of the work we study dependence of resonance frequencies of localized modes excited by a finite array of parallel thin wires illuminated by normally incident plane electromagnetic wave with respect to the array height over the interface. Due to the symmetry only two main modes are excited. It is important that when the height of the array becomes sufficiently small the order of the resonance modes changes. We apply numerical analysis based on the Pocklington system of integral equations to compute resonance frequencies and construct excited localized modes above the array. We also compare our results against computations obtained by means of another independent numerical model.