Effects of basic period Structure of One-dimensional Photonic Crystals on the Photonic Band Gap

The formulas of reflectivity were derived in one-dimensional photonic crystals with the method of the characteristic matrix.With this method,the reflectivity of-polarized light and-polarized light of one-dimensional photonic crystal with specific structure was calculated when the optical thickness of the basic period structure of the photonic crystal is changed.The results show that the photonic band gap connects to the optical thickness of the basic period structure of the photonic crystal.For different polarized light,the effect of the optical thickness on the photonic band gap is different.Control of the photonic band gap design can be achived via changing the optical thickness according to the requirement of the photonic crystal.