The effect of structure perturbation on PBG of one-dimensional photonic crystals

By introducing structure perturbation coefficients with different levels, relevant effects on PEG and density of mode(DOM) in ID photonic crystal had been detailedly discussed under specifying numbers of bilayer and contrast of refractive index in this paper. Numerical simulation indicates that there are remarkable influences on optical properties of ID photonic crystal resulted by structure perturbation, especially for PEG location and DOM at band edge. Generally, both PEG shifting and shrinking occurs due to disruptive periodicity. In specific case, especially along with perturbation coefficient increasing, it is found that PEG is extended obviously and the higher DOM at the band edge also can be obtained. According to this, some conclusions had been drawn which are significant to developing omnidirectional reflectors, band edge lasers and other devices based ID photonic crystals.