摘要
THz通信及检测等应用领域迫切需要THz窄带滤波及频分复用等损耗小可集成的器件,设计了一种基于光子晶体点缺陷和线缺陷的THz频分复用器。该系统是在空气和高阻硅构成的二维正方形结构光子晶体中设置两个线缺陷实现上下载波导功能,同时设置两个间隔的空气点缺陷实现频率选择功能。利用平面波展开法和时域有限差分方法,分析了这种结构的光子晶体缺陷模特征及线缺陷和点缺陷之间的耦合特征,下载波导输出端的频谱表明在0.927THz和1.184THz处有两个窄带输出峰,当改变两个空气点缺陷之间的硅柱半径时,两个窄带峰的中心频率可调。
A THz frequency division multiplexer based on two-dimensional photonic crystal defects is designed and analyzed.The device consists of two waveguides formed by line defects in photonic crystal as up and load waveguides and two air point defects separated by a silica rod as frequency selectors whose selected frequency can be tuned by the radius of the air defects and the silica rod between them.The results simulated by plane wave expansion method and finite difference time domain method indicate that the frequency division multiplexer has two narrow band peaks at 0.927 THz and 1.184 THz.
出处
《科学技术与工程》
2010年第25期6253-6256,共4页
Science Technology and Engineering
基金
国家973计划(2007CB310403)
国家自然科学基金(60772105
10704043)资助
关键词
THz频分复用器
光子晶体
时域有限差分法
THz frequency division multiplexer photonic crystal finite difference time domain method
