Absolute photonic band gaps of 2-D cubic compound lattice

In order to obtain the absolute photonic band gaps,we design a two-dimension cubic compound lattices made of dielectric cylinders with an air hole in their centers and study its photonic band structures with the plane-wave method. An absolute photonic band gaps common to E and H polarized waves are created when given proper structure parameters,which tells us that absolute photonic band gaps can be created from a simple lattice.