In this article, we propose a rectangular slotted porous core photonic crystal fiber (RSPC-PCF) for sensing the CO₂ gas. The RSPC-PCF is made of purely silica material with rectangular air holes in core and circular air holes in cladding. The COMSOL Multi-physics software with version 4.5.150 is used as a design and simulation tools. The effects of tuning the geometrical parameters have been numerically analyzed by using full-vector finite element method (FEM). The numerical results show the maximum relative sensitivity of 24% and minimum confinement loss of 0.0012 dB/m at 4 μm the absorption wavelength of CO₂ gas. In addition, numerical aperture (NA) is also explored to check the light acceptance of the sensor. Since our proposed design is very simple having better sensitivity, it will be a suitable candidate for sensing the CO₂ gas in the earth's atmosphere effectively.

在本文中，我们提出了一种矩形缝隙多孔芯光子晶体光纤（RSPC-PCF），用于检测CO ₂气体。RSPC-PCF由纯二氧化硅材料制成，芯部带有矩形气孔，覆层带有圆形气孔。版本4.5.150的COMSOL Multi-physics软件用作设计和仿真工具。通过使用全矢量有限元方法（FEM）数值分析了调整几何参数的效果。数值结果表明，在CO ₂的吸收波长为4μm时，最大相对灵敏度为24％，最小限制损耗为0.0012 dB / m加油站。此外，还探索了数值孔径（NA）来检查传感器的光线接受度。由于我们提出的设计非常简单且灵敏度更高，因此它将是有效检测地球大气中CO ₂气体的合适候选者。