环烯烃共聚物多孔太赫兹纤维的设计与特性模拟  

Design and characteristics of cycloolefin copolymer porous terahertz fiber

作　　者：马天[1] 孔德鹏[1] 姬江军[1] 王光珍[1] 王丽莉[1] 

机构地区：[1]中国科学院西安光学精密机械研究所瞬态光学与光子技术国家重点实验室,陕西西安710119

出　　处：《红外与激光工程》2013年第3期631-636,共6页Infrared and Laser Engineering

基　　金：国家自然科学基金(61275106;61108061)

摘　　要：太赫兹纤维波导是太赫兹系统中重要的组成元件。为了实现太赫兹辐射的低损耗低色散传输,设计了一种以环烯烃共聚物为基质的多孔太赫兹纤维,并利用基于全矢量有限元法的商业软件COMSOL分析了该多孔太赫兹纤维的传输特性,着重考察了亚波长多孔纤芯的结构参数对传输特性的影响。结果表明,这种太赫兹纤维可以将模场能量很好地限制在亚波长多孔纤芯中传输,具有较小的有效模场面积、低的传输损耗和平坦近零色散等优良的传输特性;同时,通过增大多孔纤芯的占空比,可以将更多的模场能量限制在亚波长直径的空气孔洞中传输,并减小太赫兹纤维的有效模场面积和有效模式损耗,但同时会增大限制损耗和色散。Terahertz fiber is one of the essential components in the terahertz system. In order to realize minimum low loss and dispersion of terahertz transmittion, a novel hollow terahertz fiber was designed and optimizated, which was based on Topas COC. Using the commercial software COMSOL based on the full-vector finite element method, the transmitting characters of this hollow terahertz fiber were calculated and the effects of the structural parameters on transmitting THz wave in the porous fiber core were analyzed. The research shows that adopting designed porous structure can confine the mode energy in porous core, and obtain small mode area, low propagation loss and nearly zero ultra-flattened dispersion. Increasing rate of the hole diameter to the hole spacing, the more mode energy can be confined in the porous fiber core, and the effective mode area and effective mode loss were reduced, but the confine loss and dispersion would be enlarged simultaneously.

关 键 词：多孔亚波长太赫兹纤维 环烯烃共聚物 全矢量有限元法 传输特性 

分 类 号：O439[机械工程—光学工程]