光子晶体磁性微腔非对称耦合的非互易传输  

Nonreciprocal Transmission Based on Nonsymmetric Coupling of Magnetic Microcavity in Photonic Crystal

作　　者：汤月明[1] 方云团[2] 吕翠红[1] 王纪俊[1] 

机构地区：[1]江苏大学理学院,江苏镇江212013 [2]江苏大学计算机学院,江苏镇江212013

出　　处：《中国激光》2015年第6期209-215,共7页Chinese Journal of Lasers

基　　金：国家自然科学基金(11304126)

摘　　要：为了实现光的非互易性传输,在一维光子晶体中插入两个非对称的金属磁性材料缺陷层。插入的金属磁性材料在光子晶体中形成了不对称的磁性微腔。运用适用于磁光材料的传输矩阵方法研究结构的传输特性。由于金属磁性材料破坏时间反转对称,同时非对称微腔结构打破了空间反转对称,使得结构产生了非互易性的传输。随着入射角度的增大,非互易通道的间距也不断增加,并在50°时达到最大值,然后逐渐减小。当外加磁场增大时,非互易通道的间距也随之不断增大并且在某一特定值时达到最大值。最终的结果采用基于有限元法的电磁场仿真软件进行仿真验证。A one-dimensional photonic crystal structure including two nonsymmetric magneto-optical （MO） metal defects is proposed to achieve nonreciprocal transmission. The nonsymmetric magnetic microcavities are made of the MO metal defects in photonic crystal. The transmission properties of the structure are studied by the transfer matrix method based on the MO material. The MO effect breaks the time-reversal symmetry while the coupling of two nonsymmetric microcavities breaks the mirror symmetry, which results in nonreciprocal transmission. With the increase of incident angle, the interval of two nonreciprocal tunneling channels increases and reaches its maximum at 50~. When the external magnetic field increases, the interval of two nonreciprocal tunneling channels increases and reaches a maximum at a certain value. The results are demonstrated through an electromagnetic field simulation based on the finite element solver.

关 键 词：物理光学 光子晶体 非互易性 缺陷模 磁光效应 磁性微腔 

分 类 号：O734[理学—晶体学]