The impact of imperfect symmetry on band edge modes of a two-dimensional photonic crystal with square lattice

A theoretical analysis has been performed by means of the plane-wave expansion method to examine the dispersion properties of photons at high symmetry points of an InP based two-dimensional photonic crystal with square lattice. The Q factors are compared qualitatively. The mechanism of surface-emitting is due to the photon manipulation by periodic dielectric materials in terms of Bragg diffraction. A surface-emitting photonic crystal resonator is designed based on the phenomenon of slow light. Photonic crystal slabs with different unit cells are utilized in the simulation. The results indicate that the change of the air holes can affect the polarization property of the modes. So we can find a way to improve the polarization by reducing the symmetry of the structure.

Chinese National Key Basic Research Special Fund/CNKBRSF 2006CB921700 State Key Program for Basic Research of China 10634080 National Natural Science Foundation of China 60677046 National High Technology Research and Development Program of China 2006AA03Z403 This work is supported by the Chinese National Key Basic Research Special Fund/CNKBRSF, 2006CB921700, Project supported by the State Key Program for Basic Research of China (Grant No. 10634080), 10634080, Project supported by the National Natural Science Foundation of China (Grant No. 60677046), 60677046, and Project supported by the National High Technology Research and Development Program of China (Grant No. 2006AA03Z403), 2006AA03Z403.