2-5THz宽频段多孔纤芯高双折射低损耗太赫兹光子晶体光纤
投稿时间:2020-08-15  修订日期:2020-11-05  点此下载全文
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作者单位E-mail
惠战强 西安邮电大学 电子工程学院 zhanqianghui@xupt.edu.cn 
张甜甜 西安邮电大学 电子工程学院  
韩冬冬 西安邮电大学 电子工程学院 handongdong@xupt.edu.cn 
赵峰 西安邮电大学 电子工程学院 hfengzhao@126.com 
杨祎 西安邮电大学 电子工程学院 yangyi@xupt.edu.cn 
张美志 西安邮电大学 电子工程学院 meizhi_zhang@126.com 
巩稼民 西安邮电大学 电子工程学院 gjm@xupt.edu.cn 
基金项目:国家自然科学基金(61775180, 61875165, 61772417)资助,陕西省教育厅协同创新项目(20JY060)资助;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)资助。
中文摘要: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3.5THz处,得到0.0965(接近10-1)的超高双折射,10-12dB/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为迄今已知太赫兹聚合物光纤中最高,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。
中文关键词:光子晶体光纤  太赫兹  高双折射  有效材料吸收损耗
 
A novel broadband porous core terahertz photonic crystal fiber with high birefringence and ultralow loss in 2-5 THz range
Abstract:Abstract: 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 10-12dB/cm and the effective material absorption loss less than 1 cm?1 are obtained at the frequency of 3.5THz. 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.
keywords:Photonic crystal fiber  terahertz  high birefringence  effective material absorption loss
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