Impurity Modes of One-dimensional Photonic Crystals Containing Single-negative Materials
含单负材料的一维光子晶体的杂质模

The photonic band gap structure of one-dimensional photonic crystal containing single-negative materials with an impurity layer is studied by using transfer matrix method.The impurity is double layers positive-index materials.Investigations show that the frequency of the impurity mode is insensitive to scaling and disorder of lattice.When the thickness and layers of the impurity increase,the impurity mode frequency will decrease and its rate of change will increase,and the velocity of the impurity mode vanished into the edge of low-frequency will become faster and faster.