摘要
设计了一种基于二维硅光子晶体的太赫兹波波分复用器件.该光子晶体器件采用点、线缺陷组合的结构,数对不同大小的点缺陷分别放置在线缺陷侧面的相应位置.根据描述谐振腔与波导之间耦合问题的耦合模理论,当太赫兹波在器件中传播时点线缺陷中的电磁波模式之间将发生相互耦合.基于这种机制,器件可以通过设置不同大小的点缺陷将相应谐振波长的太赫兹波下载下来.仿真结果表明,器件体积小巧、易于集成,信道平均间隔大约为0.5μm,并且各信道的下载效率均高于90%.
A novel terahertz wavelength division multiplexer based on the two dimensional silicon photonic crystals is presented.The structure of photonic crystals combined point defects and line defects,in which a few pairs of point defects with different sizes are correspondingly placed in the side of line defects.According to the coupled mode theory which describing the coupling problem between resonant cavity and waveguide,the modes of electromagnetic wave between point defects and line defects will coupled with each other when terahertz waves propagate in the device.Based on this mechanism,the device can be used to drop a few terahertz waves of corresponding resonant wavelength by setting different sizes of point defects.The numerical simulating results show that the device is compact and easy to integrate.The average channel gap of the device is about 0.5 μm and the dropping efficiency of each channel is higher than 90%.
出处
《南京信息工程大学学报（自然科学版）》
CAS
2010年第3期193-197,共5页
Journal of Nanjing University of Information Science & Technology（Natural Science Edition）
基金
南京邮电大学科研基金(NY207053)
关键词
光电子学
波分复用器
耦合模理论
太赫兹波
光子晶体
optoelectronics
wavelength division multiplexer
coupled mode theory
terahertz wave
photonic crystal
