We theoretically investigate waveguide structures in three-dimensional metallic photonic band-gap (MPBG) materials. The MPBG materials used in this study consist of a three-dimensional mesh of metallic wires embedded in a dielectric. An L-shaped waveguide is created by removing part of the metallic wires. Using finite difference time domain simulations, we found that an 85% transmission efficiency can be achieved through the 90° bend with just three unit cell thickness MPBG structures.

• Received 9 April 1999

DOI:https://doi.org/10.1103/PhysRevB.60.4426