摘要
应用传输矩阵法研究了以三层单负材料为周期单元对称型一维光子晶体(ABC)M(CBA)M的零有效相位带隙发现:与布拉格禁带不同,该零有效相位带隙对结构周期数、入射角、光波的偏振性均不敏感。当各介质层取不同厚度比时,零有效相位带隙中隧穿模透射率的变化有差异。在各介质层厚度比不变的前提下,成倍增大各介质层厚度(结构晶格常数增大)时,通带向着中心频率靠近同时收缩变窄,高、低频区域的隧穿模透射率分别以不同比率急剧衰减最后消失,这一特性可以用来设计双通道窄带零有效相位延迟滤波器。
The one-dimensional photonic band-gap of symmetrical structured consisting of the Cycle Unit of three single-negative materials in the form of（ABC）M（CBA）M are studied by transfer matrix method.The results show that this kind of symmetrical structured one-dimensional photonic crystal has a special photonic gap with zero effective phase and without sensitivity to number of cycles or the angle of incidence and the nature of the lighe waves.When the medium layer take different thickness ratio,transmission rate of tunneling mode in zero effective phase band gap in changes have differences.When the ratio of the thicknesses of three media unchanged,and the dielectric layers thickness are exponentially increasede,high-frequency passband and low-frequency passband are respectively shrunk and narrowed,moved to the center frequency,the tunneling modes transmission rate of high and low frequency region respectively in different ratio rapid attenuation and finally disappeared.This feature can be used to design omni-directional dual-channel filters,and its effective wave vector is zero,so can be used to design omni-directional zreo-phase-shift filters.
出处
《湖北第二师范学院学报》
2013年第2期11-13,共3页
Journal of Hubei University of Education
关键词
光子晶体
零有效相位带隙
传输矩阵
单负材料
photonic crystal
zero effective phase band gap
transfer matrix method
single-negative material
