This paper contributes a novel design of photonic crystal fiber (PCF) with a combination of porous core structure and TOPAS as background material is proposed for chemical sensor in terahertz regime. A finite element method (FEM) has been used for investigation of the optical properties such as relative sensitivity, power fraction (PF), effective area, numerical aperture (NA) and confinement loss of the proposed structure. The findings of the simulations show that the proposed structure provides high relative sensitivity with low confinement loss for sensing different chemical substances like ethanol, benzene, and water. The relative sensitivity of the proposed sensor is 70 %, 68.59 % and 67.62 % for benzene, ethanol, and water, respectively at a frequency of 1.14 THz. Confinement loss of the proposed sensor has the order of 10⁻¹¹ dB/m, which is very low and therefore convenient for practical applications as chemical sensor. In addition, V-parameter, Marcuse spot size (MSS) and Beam divergence (BD) are also carefully examined from 0.2 THz to 1.3 THz. The proposed sensor is mainly used to detect toxic chemicals for commercial purposes.

本文提出了一种新颖的光子晶体光纤（PCF）设计，该结构结合了多孔芯结构和TOPAS作为背景材料，用于太赫兹化学传感器。有限元方法（FEM）已用于研究光学性能，如相对灵敏度，功率分数（PF），有效面积，数值孔径（NA）和所提出结构的限制损耗。仿真结果表明，该结构为传感乙醇，苯和水等不同的化学物质提供了较高的相对灵敏度和较低的限制损耗。所提出的传感器在1.14 THz的频率下对苯，乙醇和水的相对灵敏度分别为70％，68.59％和67.62％。拟议的传感器的限制损耗约为10^-11  dB / m，非常低，因此方便用作化学传感器的实际应用。此外，还仔细检查了从0.2 THz到1.3 THz的V参数，Marcuse光斑大小（MSS）和光束发散（BD）。提出的传感器主要用于检测有毒化学物质，以用于商业目的。