Large Absolute Band Gaps of 2D Photonic Crystals
大带隙二维光子晶体结构的研究

For three types of conventional 2D photonic crystals with medium column’s cross sections’ shapes of hexagon,square and circular,a method that decreases the length in X direction to be p times and rotates shapes with angle φ for increasing the PBG of the photonic crystals was brought forward.The symmetry of the structures were decreased through changing the values of p and φ.With simulation using planar wave expansion method,the results were show that max PBG rate can reach above 12%,due to the photonic crystals of the three types of medium column with triangular lattice.Especially for photonic crystals of rectangle column with triangular lattice,the max PBG rate arrives at 15.1%.