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We study beam transmission and refection resulting from the resonantexcitation of forward and backward surface waves in a metamaterial. We predictthat exciting these waves at an interface this medium and free space led totransmitted and reflected beams with high amplitudes. The FDTD simulatedresults demonstrate clearly propagation of these waves and theirenergy-trapping ability as described by theory. The resonant coupling of therefracted waves and reflected waves at the first interface led to theexcitation of the backward surface waves. The forward surface waves transferincoming energy in the direction of incidence and the backward surface transferincoming energy in a direction opposite to the direction of incidence (i.e.negative direction). More also, the parameters used in these simulations werecarefully chosen to minimize the effects of interference between the incidentand the reflected beams earlier reported. In overall, these numericallysimulated results clearly demonstrate the propagation of these waves and mayserve as numerical approximations to what might be observed in experimentalsetups. Putting this simply, they may find applications in optical and photonicdevices involving enhancing beam transmission and reflection usingnegative-index metamaterial.

Excitation of forward and backward surface waves in a negative-index metamaterial