基于旋磁材料一维光子晶体单向传输  

One-dimensional Photonic Crystal Unidirectional Transmission Based on Gyromagnetic Material

作　　者：徐青松[1] 方云团[1] 周骏[2] 

机构地区：[1]江苏大学计算机科学与通信工程学院,镇江212013 [2]宁波大学理学院物理系,宁波315211

出　　处：《人工晶体学报》2016年第4期1131-1137,共7页Journal of Synthetic Crystals

基　　金：国家自然科学基金(61275153;61320106014);<应用非线性科学与技术>浙江省重中之重学科开放基金(xkzw11522)

摘　　要：为了实现光的非互易效应,本文设计了四种周期性结构的一维光子晶体,利用基于旋磁材料的传输矩阵公式,计算结构的传输谱。通过外加磁场的作用,破坏系统的时间反演对称。研究发现时间反演对称的破缺必须结合空间结构对称的破缺,才可实现单向传输,并且这种对称性破坏的越严重,正反方向透射谱的分离度越高。旋磁材料作为一维光子晶体缺陷层,不仅结构简单,而且正向透射率接近100%。在入射角为45°时,正反方向透射消光比在缺陷层厚度为400μm时达到最大值0.98。In order to achieve the nonreciprocal effect of light,four kinds of one-dimensional periodic structure were design. The transmission spectrum was calculated by means of transfer matrix method with gyromagnetic material. The time reversal symmetry is broken by the effect of external magnetic field. The study results show that to achieve unidirectional transmission time reversal symmetry breaking must be combined with spatial inversion symmetry breaking,and the more serious the symmetry breaking,the bigger interval between the transmission peaks corresponding to the forward and backward directions. The one-dimensional photonic crystal with gyromagnetic material defect has not only a simple structure but also the forward transmittance close to 100%. The extinction ratio of forward and backward transmission at incident angle of 45° reaches the maximum value 0. 98 at about 400 μm.

关 键 词：非互易效应 旋磁材料 时间反演对称 空间反演对称 消光比 

分 类 号：O731[理学—晶体学]