title: Terahertz polarization splitter based on orthogonal microstructure dual-core photonic crystal fiber.
abstract: A broadband polarization splitter operating in the terahertz (THz) band is proposed based on dual-core photonic crystal fiber with orthogonal microstructure in the core regions. The Index Converse Matching Coupling method is presented to design the THz polarization splitter for the first time, which exhibits several advantages, such as short splitting length, high extinction ratio, low loss, and broad operation bandwidth. By numerical simulation, it has been found that the strong coupling occurs within a frequency range of 0.4-0.7 THz. The operation bandwidth is more than 0.15 THz (equal to 138 μm). The shortest splitting length is only 1.83 cm at 0.4 THz. The extinction ratios for both of x and ypolarization are better than -15 dB when the frequency is larger than 0.51 THz. The lowest material absorption loss is only 0.34 dB at 0.4 THz. Moreover, this structure is simple to design and easy to fabricate over its counterparts in the communication band. Our research offers an effective method to design a broadband THz device and would be of significance for future relevant applications.
authors.affiliation: Institute of Modern Optics, Nankai University, Key Laboratory of Optoelectronic Information Science and Technology, Ministry of Education, Tianjin 300071, China.
authors.forename: Shanshan
authors.initials: S
authors.lastname: Li
authors.forename: Hao
authors.initials: H
authors.lastname: Zhang
authors.forename: Yu
authors.initials: Y
authors.lastname: Hou
authors.forename: Jinjun
authors.initials: J
authors.lastname: Bai
authors.forename: Weiwei
authors.initials: W
authors.lastname: Liu
authors.forename: Shengjiang
authors.initials: S
authors.lastname: Chang