An elliptical core based hybrid structured photonic crystal fiber (PCF) is proposed and analyzed in order to identify the fuel adulteration level using the terahertz spectrum. The performance of the proposed sensor is assessed by COMSOL software which uses the finite element method as a solver. At 2.8 THz, the proposed sensor shows an extremely high relative sensitivity of 102% with a very small confinement loss of 3.46× 10⁻¹¹ cm⁻¹ and a high numerical aperture of 0.45. Moreover, the proposed sensor also shows a large effective area of 1.715× 10⁻⁸ m² with a low effective material loss of 0.0105 cm⁻¹ at optimum structural conditions. Except for one elliptical air hole in cladding, the optical sensor contains circular air holes which ensure less complexity during fabrication. The sensor's excellent sensing and guiding properties will make it a competitive candidate in chemical sensing applications.

提出并分析了一种基于椭圆芯的混合结构光子晶体光纤 (PCF)，以便使用太赫兹光谱识别燃料掺假水平。所提出的传感器的性能由 COMSOL 软件评估，该软件使用有限元方法作为求解器。在 2.8 THz 时，所提出的传感器显示出 102% 的极高相对灵敏度，具有 3.46× 10 ^-11  cm ^-1的非常小的限制损失和 0.45 的高数值孔径。此外，所提出的传感器还显示出 1.715× 10 ^-8  m ²的大有效面积和 0.0105 cm ^-1的低有效材料损失在最佳结构条件下。除了包层中的一个椭圆形气孔外，光学传感器包含圆形气孔，以确保制造过程中的复杂性较低。该传感器出色的传感和引导特性将使其成为化学传感应用中的一个有竞争力的候选者。