Thin-film photonic crystal omnidirectional reflector used in visible region

Thin-film one-dimensional photonic crystal omnidirectional reflector used in visible region can be achieved by using angle domain overlapping reflectance bands. By using this method, the relative band width of the omnidirectional reflector consisting of four TiO2/SiO2 thin-film photonic crystals is up to 41.33%. By comparison, the relative band width. of the omnidirectional reflector constructed under the same condition as the above is only 14.26% by using the conventional frequency domain overlapping. The basic principle of the angle domain overlapping is described. A thin-film one-dimensional photonic crystal omnidirectional reflector used in visible region is calculated and given. Meanwhile, the omnidirectional reflector used in ultraviolet region can be constructed by using this new method, which cannot be obtained by the conventional method.