Guided modes in a two-dimensional metallic photonic crystal waveguide are s
tudied. The guided modes in the photonic crystal waveguide are related to t
hose in a conventional metallic waveguide. There exists a cutoff frequency
and consequently a mode gap at low frequencies (starting from zero frequenc
y) in the photonic crystal metallic waveguide. (C) 2000 Published by Elsevi
er Science B.V. All rights reserved.