In terahertz frequency (THz), we have proposed a hollow core photonic crystal fiber (HC-PCF) to sense chemical. The proposed sensor consists of square shaped air holes in the cladding region with a dumbbell shaped core which has been used to fill with sample liquid. A wide range of frequency has been considered to analysis the performance of the sensor in term of relative sensitivity, effective material loss, confinement loss and effective mode area. Finite element method (FEM) has used to design and analysis numerically the optical parameters of our proposed HC-PCF sensor. To optimize the fabrication tolerance and sensing performance of the proposed sensor, square shaped air holes length, strut and core size has been also studied. Maximum relative sensitivity of 96.25%, confinement loss of 2.11×10⁻¹⁴ cm⁻¹, effective material loss of 9.16×10⁻⁴ cm⁻¹ and effective mode area of 1.29 × 10⁶μm² has been obtained at optimal conditions for the proposed HC-PCF sensor. We strongly believe that the optimized geometrical structure of the proposed sensor will be fabrication friendly and the sensor will contribute in real life applications.

在太赫兹频率（THz）中，我们提出了一种空心光子晶体光纤（HC-PCF）来感测化学物质。所提出的传感器由包层区域中的方形气孔组成，该气孔具有哑铃状芯，该芯已用于填充样品液体。考虑到相对灵敏度，有效材料损耗，限制损耗和有效模式面积等方面，已经考虑了大范围的频率来分析传感器的性能。有限元方法（FEM）用于设计和分析我们提出的HC-PCF传感器的光学参数。为了优化所提出的传感器的制造公差和感测性能，还研究了方形气孔的长度，支杆和铁芯尺寸。最大相对灵敏度为96.25％，限制损失为2.11×10 ^-14 cm^-1，有效的材料损失9.16×10 ^-4厘米^-1和的有效模场面积1.29  ×  10 ⁶ μ米²已在所提出的HC-PCF传感器的最佳条件获得。我们坚信，提出的传感器的优化几何结构将对制造友好，并且该传感器将在现实生活中发挥作用。