ELECTROMAGNETIC MODE DENSITY FOR FINITE QUASI-PERIODIC STRUCTURES

The transmission properties of quasi-periodic Canter-like and Fibonacc i photonic bandgap structures that have the same optical paths are stu died and compared with one-dimensional, finite, N-period stacks. The e lectromagnetic mode densities and group velocities are also discussed. We show that the density of modes at the edge of the bandgap is great er for Canter-like multilayers, so at the band edge a sharp decrease i n the group velocity is found. (C) 1998 Optical Society of America.