为实现高效的光学隔离器,设计了两边镀金属薄膜带缺陷的一维磁光光子晶体系统,并用修正的特征矩阵法研究了它的传输特性.在磁光光子晶体微腔缺陷模式与金属等离子体产生耦合共振的条件下,该结构呈现单向传输的特征.隔离器的传输性能依赖于光的入射角度、微腔和两侧金属薄膜的厚度;在入射角为45°,微腔和金属薄膜厚度分别为449 nm和150 nm时光隔离器具有较好的性能.

In order to achieve optical isolator,a system of one-dimensional magnetic photonic crystals with two metal films coated at its two sides was designed.The transmission properties of the structure through the modified transfer matrix method were studied.Due to the coupling of microcavity mode and the metal plasma,the structure shows one-way transmission feature and realizes the function of optical isolator.The performance of optical isolator is dependent on the incidence angle,thickness of the microcavity as well as the thickness of the metal.The isolator has good performance for an incidence angle of 45°,a microcavity thickness of 449 nm and a metal film thickness of 150 nm.The results are demonstrated through an electromagnetic field simulation based on the finite element solver.