Abstract: We designed onedimensional photonic crystal with a complex refractive index defects layer and calculated the transmissivity of light waves by using the quantum transfer matrix. The results show that the number of defect modes increases with the increase of the thickness of the defect layer and the positions of the defect mode move towards the direction of the smaller wavelength as the thickness of the conventional medium increases.

Key words: defect mode, photonic crystal, transmissivity