Plasmonic response in a one-dimensional periodic structure of metallic rods

The frequency response of a two-dimensional structure of metallic cylindrical rods having one-dimensional periodicity is reported. The structure is excited under transverse electric incidence of terahertz radiation, where the periodicity is of the size of the diameter of the rods. The response shows metallic behavior and leads to an effective plasma frequency which determines the lowest frequency of transmission. The results are confirmed by three independent investigations: An approximate analytic theory, computational simulations, and experiments. (C) 2005 American Institute of Physics.