摘要
用传输矩阵方法研究了由两种单负材料组成的光子晶体异质结构的透射性。结果表明,由于界面衰减模的耦合,在光子晶体异质结构的禁带中出现了一种特殊的隧穿模,该模的频率不随入射角的变化而变化,而且具有零相位延迟,这一特性可用来制作零相位延迟的全方位滤波器。而且,当材料存在耗散时,隧穿模的频率并不发生改变,改变的只是模的透射率。这将有助于滤波器的设计。
The transmission spectrum of photonic heterostructures consisting of two single-negative materials is studied by means of the transfer-matrix method. The results show that,owing to the coupling of the evanescent-wave-based interface modes,the tunneling mode appears inside the forbidden gaps. The frequency of the tunneling mode is independent on incident angles and has zero phase delay,which can be utilized to design zero-phase-shift omnidirectional filter. Meanwhile,when losses are involved,only the transmission is changed but the frequency has no change.
出处
《半导体光电》
CAS
CSCD
北大核心
2010年第3期383-386,共4页
Semiconductor Optoelectronics
基金
燕山大学科技发展基金项目(YDJJ200534)
关键词
单负材料
异质结构
隧穿模
全方位滤波器
single-negative materials
heterostructures
tunneling mode
omnidirectional filter
