等离子体光子晶体的FDTD分析  

FDTD simulation for plasma photonic crystals

作　　者：刘少斌[1] 朱传喜[1] 袁乃昌[2] 

机构地区：[1]南昌大学理学院,南昌330047 [2]国防科技大学电子科学与工程学院,长沙410073

出　　处：《物理学报》2005年第6期2804-2808,共5页Acta Physica Sinica

基　　金：国家863计划项目(批准号:2002AA731181);国防科技重点实验室基金项目(批准号:51483010301KG0102);国家自然科学基金(批准号:60471002;10461007);江西省自然科学基金(批准号:0412014)资助的课题.~~

摘　　要：等离子体光子晶体是等离子体和介质(真空)构成的人工周期性结构.用分段线性电流密度递归卷积时域有限差分(PLCDRC FDTD)算法分析了等离子体光子晶体和缺陷等离子体光子晶体.从时域的角度分析了高斯脉冲在等离子体光子晶体中的传播过程,给出了时域反射和透射波形.然后,从频域的角度分析了等离子体光子晶体和带缺陷的等离子体光子晶体的电磁反射系数和透射系数.计算表明,等离子体光子晶体对频率小于等离子体频率的低频电磁波几乎完全反射,而透射的电磁波则为频率高于等离子体频率的电磁波.在高频,等离子体光子晶体则出现类似一般光子晶体的光子带隙特性.Plasma photonic crystals are artificially periodic structures, which are composed of plasmas and dielectric structures ( or vacuum). In this paper, the piecewise linear current density recursive convolution (PLCDRC) finite-difference time-domain (FDTD) method is applied to study the plasma photonic crystals and those containing defects. In time-domain, the electromagnetic( EM) propagation process and reflection/transmission electric field of Gauss pulses passing through the plasma photonic crystals are investigated. In frequency-domain, the reflection and transmission coefficients of the pulses through the two kinds of crystals are computed. The results illustrate that the plasma photonic crystals mostly reflect for the EM wave of frequencies less than the plasma frequency, and mostly transmit for EM wave of frequencies higher than the plasma frequency. In high frequency domain, the plasma photonic crystals have photonic band gaps, which is analogous to the conventional photonic crystals.

关 键 词：时域有限差分法 等离子体光子晶体 电流密度 透射波形 

分 类 号：O734[理学—晶体学]