基于磁化等离子体缺陷层的一维新颖可调谐的光子晶体滤波特性

将磁化等离子体填充到一维光子晶体的缺陷层,构成了一种新颖可调谐的滤波器。讨论了TM波情况下滤波器的滤波特性,并推导了TM波下磁化等离子体传输矩阵。通过改进的传输矩阵方法分析得到:在不改变光子晶体结构的情况下,通过改变等离子体频率和外磁场可以实现滤波通道在光子禁带内较大带宽范围的移动,同时禁带中滤波通道出现的数目也能被等离子频率与外磁场的大小控制。

A Novel Tunable Filter Using Magnetized Plasma Defect in One-demension Photonic Crystal

A novel tunable filter featuring the defect mode of the TM wave from one-dimensional photonic crystals doped by magnetized plasma is investigated.Firstly,based on the continuous condition of boundary,the transfer matrix is deduced for magnetized plasma where external magnetic field is perpendicular to wave vector.Then by the transfer matrix method(TMM),we find out that the frequency of the defect mode can be modulated by plasma frequency or external magnetic field.Without changing the structure of the photonic crystal,the location of the defect mode can be modulated in a larger frequency range,and the number of the defect modes can also be controlled.