In this research work, we have proposed an excellent work combination of five layers spherical shape in cladding area with two layers of same circular shape in rotated-hexa core based decagonal photonic crystal fiber (D-PCF) and explicated the simulation outcomes for chemicals finding in the terahertz (THz) ranges. The finite element method (FEM) and perfectly matched layers (PML) boundary complaint based on COMSOL Multiphysics has been cast off to design this structure with proper numerical parameters. After the numerical analysis, this fiber shows the high relative sensitivity are 78.56%, 79.76% and 77.51% and low confinement losses are 5.80 × 10⁻⁰⁸, 6.02 × 10⁻⁰⁸ dB/m and 5.74 × 10⁻⁰⁸ dB/m for three chemicals such as Ethanol (n = 1.354), Benzene (n = 1.366) and Water (n = 1.330), respectively at monitoring region of 1 THz. Moreover, other optical properties such as effective mode index (EMI), effective area (EI), the total power fraction (TPF) are highly deliberated with their necessary graphical results. So, it is clearly seen that our suggested decagonal photonic crystal fiber (D-PCF) will be more appropriate in industrial areas and bio-medicine areas for chemical sensors especially, gas sensors to find potential applications in hospitals, industries and also for environmental monitoring.

在这项研究工作中，我们提出了一种出色的工作组合，将包层区域中的五层球形与两层相同圆形的六面体旋转六边形光子晶体光纤（D-PCF）结合在一起，并阐明了寻找化学物的模拟结果在太赫兹（THz）范围内。基于COMSOL Multiphysics的有限元方法（FEM）和完美匹配层（PML）边界问题已被淘汰，以使用适当的数值参数设计此结构。经过数值分析，该光纤显示出较高的相对灵敏度分别为78.56％，79.76％和77.51％，而低限制损耗分别为5.80×10 ^−08，6.02 ×10 ⁻⁰⁸  dB / m和5.74×10 ⁻⁰⁸  dB / m。三种化学物质，例如乙醇（n 监测区域为1 THz时 ，苯（n = 1.354），苯（n  = 1.366）和水（n = 1.330）。此外，其他光学特性（例如有效模式指数（EMI），有效面积（EI），总功率分数（TPF））也通过其必要的图形结果进行了深入研究。因此，可以清楚地看到，我们建议的十边形光子晶体光纤（D-PCF）将更适合工业领域和生物医学领域中的化学传感器，尤其是气体传感器，以在医院，工业以及环境监测中找到潜在的应用。