Effect of nondispersive defects on transmission spectrum of GaN dispersive photonic crystals

The transmission spectrum 2D GaN dispersive photonic crystal (PhC) has been investigated by using finite element method (FEM). Calculations show that by replacing nondispersive defect instead of GaN dispersive rods in PhC, electromagnetic (EM) waves can propagate in photonic band gap. Transmission spectrum for different types of nondispersive defects for linear and bend PhC waveguide is carried out and compared together. By selecting suitable dispersive PhC material and different nondispersive defects, the number and position of transmission modes can be controlled. Calculations show that number of transmission modes in the band gap depends on kind of PhCs, kind of defects and kind of PhC waveguide.