摘要
提出了一种以Topas环烯烃共聚物为基底,采用级联六边形单元多孔纤芯结构的宽频带高双折射太赫兹光子晶体光纤。采用全矢量有限差分法对其导波特性进行分析,结果表明:在工作频率为3.5 THz处,得到0.0965(接近10-1)的超高双折射,10^(-12) dB/cm的超低限制损耗,以及小于1 cm^(−1)的有效材料吸收损耗。此外,所提出的结构在2.25~5 THz的频带内表现出±0.2 ps/THz/cm的近零平坦色散。该光纤所实现的双折射值不仅是迄今已知太赫兹聚合物光纤中最高的,而且其新颖的多孔纤芯结构设计有效降低了太赫兹波的传输损耗。同时,光纤结构均采用圆形空气孔,便于工程制备,该工作对今后太赫兹光子晶体光纤的发展具有一定的参考价值。
A novel broadband high birefringence terahertz photonic crystal fiber(PCF)with cascaded hexagonal unit porous core based on Topas cycloolefin copolymer is proposed.The full vector finite difference method is used to analyze the guided wave characteristics.The results show that the ultra-high birefringence of 0.0965(close to 10^(-1)),the ultra-low confining loss of 10^(-12) dB/cm and the effective material absorption loss less than 1 cm−1 are obtained at the frequency of 3.5 THz.In addition,the proposed PCF exhibits nearly zero flat dispersion of±0.2 ps/THz/cm in the frequency of 2.25~5 THz.The birefringence value of the proposed PCF is not only the highest among the reported THz polymer fibers,but also the novel porous core structure effectively reduces the transmission loss of THz wave.Moreover,only circular air holes are used in the fiber,which is feasible for engineering fabrication.This work has certain reference value for the future development of THz PCF.
作者
惠战强
张甜甜
韩冬冬
赵峰
张美志
巩稼民
HUI Zhan-Qiang;ZHANG Tian-Tian;HAN Dong-Dong;ZHAO Feng;ZHANG Mei-Zhi;GONG Jia-Min(College of Electronic Engineering,Xi’an University of Posts and Telecommunications,Xi’an,710121,China)
出处
《红外与毫米波学报》
SCIE
EI
CAS
CSCD
北大核心
2021年第5期616-626,共11页
Journal of Infrared and Millimeter Waves
基金
国家自然科学基金(61775180,61875165,61772417)
陕西省教育厅协同创新项目(20JY060)
西安邮电大学联合研究生培养工作站(YJGJ201905)
西邮新星(2016)和研究生创新基金(CXJJLZ2019032)。
关键词
光子晶体光纤
太赫兹
高双折射
有效材料吸收损耗
Photonic crystal fiber
terahertz
high birefringence
effective material absorption loss
