Guiding terahertz orbital angular momentum beams in multimode Kagome hollow-core fibers

被引：65
作者：
Li, Haisu [1 ]
Ren, Guobin [1 ]
Zhu, Bofeng [1 ]
Gao, Yixiao [1 ]
Yin, Bin [2 ]
Wang, Jing [3 ]
Jian, Shuisheng [1 ]
机构：
[1] Beijing Jiaotong Univ, Inst Lightwave Technol, Key Lab All Opt Network & Adv Telecommun Network, Beijing 100044, Peoples R China
[2] Ocean Univ China, Ocean Remote Sensing Inst, Qingdao 266100, Peoples R China
[3] Sci & Technol Opt Radiat Lab, Beijing 100854, Peoples R China
来源：
OPTICS LETTERS | 2017年 / 42卷 / 02期
基金：
中国国家自然科学基金;
关键词：
PHOTONIC CRYSTAL FIBER; WAVE-GUIDES; VORTEX BEAM; RING FIBER; THZ; GENERATION; MODES; TRANSMISSION;
D O I：
10.1364/OL.42.000179
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We explore terahertz (THz) orbital angular momentum (OAM) modes supported in multimode Kagome hollow-core fibers. Numerical models are adopted to characterize the effective indices and confinement losses of vector modes over 0.2-0.9 THz, where two low-loss transmission windows are observed. Linearly combining the vector modes, THz OAM states can be generated. Covering a broad bandwidth of 0.25 THz, the purity values of OAM modes are beyond 0.9. Using numerical simulations, the hollow-core THz fibers with one and two rings of Kagome structures are also comparably investigated. We reveal that the OAM purity is dependent upon the confinement performance of THz fiber. (C) 2017 Optical Society of America
引用
收藏
页码：179 / 182
页数：4
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