Surface-wave guiding using periodic structures

In this paper, we present finite-difference time-domain (FDTD) simulations of two periodic frequency-selective waveguides: (1) a periodic lattice of dielectric rods where the waveguide is formed by removing some of the rods; and (2) a periodic lattice of metallic plates above a ground connected to the ground by metallic posts. The first photonic bandgap (PBG) waveguide is designed to operate in the optical region from 1.5 to 2 /spl mu/m wavelength, and it exhibits over 30 dB rejection in unwanted directions. The second PBG structure is designed to exhibit a bandgap in the microwave range from 10 to 12 GHz, and also shows over 30 dB attenuation of guided field in the unwanted directions.