Polarization-Maintaining Hollow-Core Photonic Bandgap Few-Mode Fiber in Terahertz Regime Xiao, Han ; Li, Haisu ; Ren, Guobin ; Dong, Yue ; Xiao, Shiying ; Jian, Shuisheng Abstract Publication: IEEE Photonics Technology Letters Pub Date: January 2018 DOI: 10.1109/LPT.2017.2780282 Bibcode: 2018IPTL...30..185X