A new structure of hexahedron core with the heptagonal shape of cladding regions based on photonic crystal fiber (Hx-PCF) is presented of this research work. The finite element method (FEM) and perfectly matched layers (PML) based COMSOL Multiphysics has been used to design this photonic crystal fiber (Hx-PCF) with appropriate design parameters. The fiber discloses the high relative sensitivity (RS) which stand 86.32%, 88.36%, and 84.25%, and low confinement losses along with the value of 5.60 × 10–08, 6.60 × 10–08 dB/m, and 5.55 × 10–08 dB/m for three chemicals such as Ethanol (n = 1.354), Benzene (n = 1.366) and Water (n = 1.330), respectively at operating region of 1 THz (THz). Furthermore, some other optical characteristics such as an effective mode index (EMI), effective area (EA), total power fraction (TPF), effective material loss (EML), V-Parameter are also analyzed along through essential graphic outputs. So, the results show the strong potential of this suggested Hx-PCF fiber for bio-medical areas to detect biochemicals and also industrial areas for identifying many types of chemicals by sensing procedure in the terahertz (THz) waveguide system.

提出了一种基于光子晶体光纤（Hx-PCF）的具有六边形包层区域的六面体铁芯的新结构。基于COMSOL Multiphysics的有限元方法（FEM）和完美匹配层（PML）已用于使用适当的设计参数设计此光子晶体光纤（Hx-PCF）。该光纤具有较高的相对灵敏度（RS），分别为86.32％，88.36％和84.25％，限制损耗较低，其值分别为5.60×10–08、6.60×10–08 dB / m和5.55×10乙醇（n  = 1.354），苯（n  = 1.366）和水（n = 1.330）分别在1 THz（THz）的工作区域。此外，还通过基本图形输出分析了其他一些光学特性，例如有效模式指数（EMI），有效面积（EA），总功率比（TPF），有效材料损耗（EML），V参数。因此，结果表明，这种建议的Hx-PCF光纤具有强大的潜力，可用于太赫兹（THz）波导系统中传感程序的生物医学领域，以及生物领域中的多种化学物质的识别。