[1] TONOUCHI M. Cutting-edge terahertz technology[J]. Nature Photonics, 1, 97105(2007).

[2] Zhong Ren-Bin, Zhou Jun, Liu Sheng-Gang. Research progress of terahertz waveguide[J]. Journal of University of Electronic Science and Technology of China, 41, 247-252(2012).

[3] Li Shuai, Dai Zi-Jie, Gao Xiang et al. Low-loss terahertz waveguide and its imaging application[J]. J. Infrared Millim. Waves, 38, 68-73(2019).

[4] LI Shan-Shan, ZHANG Hao, BAI Jin-Jun, LIU Wei-Wei, CHANG Sheng-Jiang. Ultrahigh birefringence terahertz porous fibers based on interlacing layered infiltration method[J]. Acta Phys. Sin., 64, 154201(2015).

[5] HUI Zhan-Qiang, QU Meng-Jia, LI Xiao-Hui et al. SnS nanosheets for harmonic pulses generation in near infrared region[J]. Nanotechnology, 31, 485706(2020).

[6] Bai Jin-Jun, Wang Chang-Hui, Huo Bing-Zhong et al. A broadband low loss and high birefringence terahertz photonic bandgap photonic crystal fiber[J]. Acta Physica Sinica, 60, 783-787(2011).

[7] RANA S, ALI S, AHMED N, ISLAM R, ALJUNID S A. Ultra-high birefringent and dispersion-flattened low loss single-mode terahertz wave guiding[J]. IET Communications, 10, 1579-1583(2016).

[8] LI Shao-Peng, LIU Hong-Jun, HUANG Nan et al. Broadband high birefringence and low dispersion terahertz photonic crystal fiber[J]. Journal of Optics, 16, 105102(2014).

[9] CHEN Hai-Bin, CHEN Da-Ru, HONG Zhi. Squeezed lattice elliptical-hole terahertz fiber with high birefringence[J]. Applied Optics, 48, 3943-3947(2009).

[10] Wang Jing-Li, Chen He-Ming. Single-Polarization Single-Mode Rhombic-Hole Terahertz Photonic Crystal Fibers[J]. Acta Physica Sinica, 34, 68-72(2014).

[11] Atakaramians S, Afshar V S, Fischer B M et al. Low dispersion and highly birefringent terahertz porous fibers[J]. Optics Communications, 282, 36-38(2009).

[12] Ren Gou-Bin, Gong Yan-Dong, Shum Ping, Yu Xia, Hu Juan-Juan. Polarization maintaining air-Core bandgap fibers for terahertz wave guiding[J]. IEEE Journal of Quantum Electronics, 45, 506-513(2009).

[13] WANG Jing-Li, YAO Jian-Quan, CHEN He-Ming, ZHONG Kai, LI Zhong-Yan. Ultrahigh birefringent polymer terahertz fiber based on a near-tie unit[J]. Journal of Optics, 13, 055402(2011).

[14] CHEN Da-Ru, TAM H Y. Highly birefringent terahertz fibers based on super-cell structure[J]. Journal of Lightwave Technology, 28, 1858-1863(2010).

[15] YANG Shu-Ai, SHENG Xin-Zhi, ZHAO Guo-Zhong, LI Shu-Ai. Simple birefringent terahertz fiber based on elliptical hollow core[J]. Optical Fiber Technology, 53, 102064(2019).

[16] YANG Tian-Yu, DING Can, ZIOLKOWSKI R W, GUO Y J. Circular hole ENZ photonic crystal fibers exhibit high birefringence[J]. Opt. Express, 26, 17264-78(2018).

[17] Li Shan-Shan, Hao Xia, Bai Jin-Jun et al. Terahertz Single-Polarization Single-Mode Photonic Crystal Fiber with Tunable Polarization[J]. Chinese Journal of Lasers, 43, 38-44(2016).

[18] ISLAM R, HABIB M S, HASANUZZAMAN G K M, AHMAD R, RANA S, KAIJAGE S F. Extremely high-birefringent asymmetric slotted-core photonic crystal fiber in THz regime[J]. IEEE Photon. Technol. Lett., 27, 2222-2225(2015).

[19] HABIB A M, ANOWER S M, HASAN R M. Ultrahigh birefringence and extremely low loss Slotted-core microstructure fiber in terahertz regime[J]. Current Optics and Photonics, 1, 567-572(2017).

[20] YANG Tian-Yu, DING Can, ZIPLKOWSKI R W, GUO Y J. A scalable THz photonic crystal fiber with partially-slotted core that exhibits improved birefringence and reduced loss[J]. Journal of lightwave technology, 36, 3408-17(2018).

[21] Ding Run-qi. Design and Properties of Photonic Crystal Fiber for Terahertz Transimission[D](2018).

[22] HASANUZZAMAN G K M, HABIB M S. A novel low loss, highly birefringent photonic crystal fiber in THz regime[J]. IEEE Photon. Technol. Lett., 28, 899-902(2016).

[23] ISLAM M S, SULTANA J, FAISAL M et al. A modified hexagonal photonic crystal fiber for terahertz applications[J]. Optical Materials, 79, 336-339(2018).

[24] HABIB M A, ANOWER M S, HASAN M R. Highly birefringent and low effective material loss microstructure fiber for THz wave guidance[J]. Opt Commun, 423, 140-144(2018).

[25] ISLAM R, HABIB M S, HASANUZZAMAN G K M, RANA S, SADATH M A. Novel porous fiber based on dual-asymmetry for low-loss polarization maintaining THz wave guidance[J]. Opt. Lett., 41, 440-443(2016).

[26] Wang Jing-Li, Yao Jian-Quan, Chen He-Ming et al. Design and study of high birefringent terahertz photonic crystal fiber with hybrid crystal lattice[J]. Acta Physica Sinica, 60, 377-382(2011).

[27] WU Zhi-Qing, ZHOU Xiao-Yan, SHI Zhao-Hua, XIA Han-Ding, HUANG Jin, JIANG Xiao-Dong et al. Proposal for high-birefringent terahertz photonic crystal fiber with all circle air holes[J]. Opt Eng, 55, 037105(2016).

[28] LUO Jian-Feng, TIAN Feng-Jun, QU Hong-Kun, LI Li, ZHANG Jian-Zhong, YANG Xin-Hua., YUAN Li-Bo. Design and numerical analysis of a THz square porous-core photonic crystal fiber for low flattened dispersion, ultrahigh birefringence[J]. Applied Optics, 56, 6993(2017).

[29] ISLAM M S, FAISAL M, ABDUR RAZZAK S M. Dispersion fattened extremely high- birefringent kagome lattice elliptic core photonic crystal fiber in THz regime[J]. Opt. Quant. Electron, 51, 1-15(2019).

[30] HASAN M R, ANOWER M S, HASAN M I, ABDUR RAZZAK S M. Polarization maintaining low-loss slotted core kagome lattice THz fiber[J]. IEEE Photonics Technology Letters, 28, 1751-1754(2016).

[31] HASANG M R, ANOWER M S, ISLAM M A, RAZZAK S M A. Polarization-maintaining low-loss porous-core spiral photonic crystal fiber for terahertz wave guidance[J]. App. Opt, 55, 4145-4152(2016).

[32] MONIR M K, HASAN M, PAUL B K et al. High birefringent, low loss and flattened dispersion asymmetric slotted core-based photonic crystal fiber in THz regime[J]. International Journal of Modern Physics B, 33, 1950218(2019).

[33] XIAO Han, LI Hai-Su, WU Bei-Lei, JIAN Shui-Sheng. Polarization-maintaining terahertz bandgap fiber with a quasi-elliptical hollow-core[J]. Optics & Laser Technology, 105, 276-280(2018).

[34] LUO Jian-Feng, CHEN Shan-Shan, QU Hong-Kun, SU Zhen-Lan, LI Li, TIAN Feng-Jun. Highly birefringent single-mode suspended-core fiber in terahertz regime[J]. Journal of Lightwave Technology, 36, 3242-3248(2018).

[35] FAISAL M, SHARIFUL ISLAM M. Extremely high birefringent terahertz fiber using a suspended elliptic core with slotted airholes[J]. Applied Optics, 57, 3340(2018).

[36] Jakeya Sultana, Md Islam, Saiful, Faisal Mohammad, Islam Mohammad Rakibul et al. Highly birefringent elliptical core photonic crystal fiber for terahertz application[J]. Optics Communications, 407(2018).

[37] WU Zhi-Qing, SHI Zhai-Hua, XIA Han-Ding, ZHOU Xiao-Yan et al. Design of highly birefringent and low-loss oligoporous-core THz photonic crystal fiber with single circular air-hole unit[J]. IEEE Photonics Journal, 8, 1-11(2016).

[38] WU Zhi-Qing, ZHOU Xiao-Yan, XIA Han-Ding, SHI Zhai-Hua, HUANG Jin et al. Low-loss polarization-maintaining THz photonic crystal fiber with a triple-hole core[J]. Appl. Opt, 56, 2288-2293(2017).

[39] Yakasai Izaddeen K., Abas Pg Emeroylariffion et al. Low loss and highly birefringent photonic crystal fibre for terahertz applications[J]. Optik, 206, 164321(2020).

[40] IALAM M S, SULTANA J, RANA S et al. Extremely low material loss and dispersion flattened TOPAS based circular porous fiber for long distance terahertz wave transmission[J]. Optical Fiber Technology, 34, 6-11(2017).

[41] NIELSEN K, RASMUSSEN H K et al. Bendable, low-loss Topas fibers for the terahertz frequency range[J]. Opt. Express, 17, 8592-8601(2009).

[42] KHANARIAN G, CELANESE H. Optical properties of cyclic olefifin copolymers[J]. Opt. Eng., 40, 1024-1029(2001).

[43] CUNNINFHAM P D et al. Broadband terahertz characterization of the refractive index and absorption of some important polymeric and organic electro-optic materials[J]. J. Appl. Phys, 109, 043505-1-5(2011).

[44] ZHU Zhao-Ming, BROWN T G. Full-vectorial finite-difference analysis of microstructured optical fibers[J]. Opt. Express, 10, 853-864(2002).

[45] ZHANG Ya-Ni, XUE Lu, QIAO Dun, GUANG Zhe. Porous photonic-crystal fiber with near-zero ultra-flattened dispersion and high birefringence for polarization-maintaining terahertz transmission[J]. Optik(2019).

[46] ISLAM M R, FAIYAZ KABIR M et al. A novel hollow core terahertz refractometric sensor[J]. Sensing and Bio-Sensing Research, 25(2019).

[47] Kajal Mondal. A comparative study of birefringence in photonic crystal fiber employing various lattice geometries with all-circular air holes[J]. Optik, 215, 164699(2020).

[48] ISLAM M S, FAISAL M, ABDUR RAZZAK S M. Dispersion flattened porous-core honeycomb lattice terahertz fiber for ultra low loss transmission[J]. IEEE Journal of Quantum Electronics, 53, 1-8(2017).

[49] BRECHET F, MARCOU J, PAGNOUX D et al. Complete analysis of the characteristics of propagation into photonic crystal fibers by the finite element method[J]. Opt. Fiber Technol., 6, 181-190(2000).