Three different horizontal proportions of geometry(the ratio of hole diameter to lattice spacing) are designed to investigate the effect of different proportions on extraordinary transmission characteristics of the photonic crystal combined with gold/silicon dioxide/silicon round holes array.The plane wave expansion method is used to simulate the photonic band gap of silicon photonic crystal under the conditions of three different horizontal ratios of geometry(0.4;0.5;0.6).For silicon photonic crystal combi...