FDTD study of surface plasmons and perfect tunneling of power in parallel-plate waveguides

Perfect tunneling of power through waveguides can be achieved by taking advantage of surface plasmon conditions. A few years ago, a waveguide filled by metamaterials with negative parameters was proposed in order to achieve such perfect tunneling behaviour. The aim of this communication is to both analyze and visualize in the time domain a structure presenting both a plasmonic resonance and perfect tunneling behaviour. This work is carried out by using the Finite Difference Time Domain (FDTD) formulation presented in [4]. As shown here, a waveguide filled with a dispersive material is necessary, but it is not mandatory for this material to be DNG. In addition, the main advantage of the FDTD formulation used here is that it is able to directly incorporate any arbitrary high-order frequency dependence of the constitutive parameters, allowing a realistic characterization of high-order dispersive materials.