低损耗高双折射太赫兹Topas光子带隙光纤  

Low Loss and High Birefringence Topas Photonic Bandgap Fiber at Terahertz Frequency

作　　者：王豆豆[1] 王丽莉[2] 张涛[1] 解忧[1] 

机构地区：[1]西安科技大学理学院,西安710054 [2]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,西安710119

出　　处：《光子学报》2014年第6期9-13,共5页Acta Photonica Sinica

基　　金：国家自然科学基金(Nos.61275106;61201088);陕西省自然科学基础研究计划项目(No.2014JQ8335);陕西省教育厅科研计划资助项目(No.2013JK1106);西安科技大学博士启动金(No.2012QDJ043);西安科技大学培育基金(No.201236)资助

摘　　要：以太赫兹低损耗聚合物材料Topas环烯烃共聚物为基材,设计了一种带隙型光子晶体光纤.光纤由三角形排列的圆角正六边形空气孔构成包层,缺失四个近邻空气孔构成近菱形的二重对称空气芯.采用有限元法分析了该光纤在太赫兹波段的传输特性.结果表明：在1.5THz附近约0.3THz的宽频范围内存在光子带隙,光纤可以基于光子带隙效应将太赫兹波束缚在空气芯中传输.在1.4~1.6THz范围内具有10-3数量级的高双折射;x偏振基模和y偏振基模的损耗都小于0.1cm-1,分别在1.53THz和1.5THz处达到最小值0.029 1cm-1和0.028 7cm-1.所设计的太赫兹Topas光子带隙光纤具备结构简单、易制备、直径小而易弯曲的特点.A photonic bandgap fiber was designed based on the novel Terahertz low-loss material Topas cyclic olefin copolymer. Fiber cladding was formed by arranging hexagonal air holes with rounded corners in triangular lattice pattern in the background of Topas. A rhombic hollow-core with rounded corners was formed by omitting four central air holes of the cladding structure. Propagation properties in the terahertz band of the fiber were investigated by using the finite element method. Numerical results indicate the fiber has a photonic bandgap within a broadband area about 0.3 THz around 1.5 THz, and THz wave is welled confined in the air core. Birefringence of the order of 10-3 was obtained. Loss of the x-and ypolarized fundamental modes is less than 0.1 cm 1 within 1.4~1.6 THz, and reaches the minimum value of O. 029 1 cm-1 and 0. 028 7 cm 1 at 1. 53 THz and 1. 5 THz, respectively. Structure of designed terahertz Topas photonic bandgap fiber is simple, feasible for fabrication and bendable because of the relatively small diameter.

关 键 词：太赫兹 光子晶体光纤 有限元方法 Topas环烯烃共聚物 光子带隙 损耗 双折射 

分 类 号：O451[理学—无线电物理]