This paper presents the design and simulation of hybrid porous core photonic crystal fiber (HPC-PCF) for monitoring nitrous oxide (N₂O) gas. The design, numerical simulation and optimization process have been accomplished by utilizing COMSOL Multiphysics software and finite element method. The simulation results show the relative sensitivity of 27% and confinement loss of 0.0034 dB/m at λ = 5 μm absorption wavelength of N₂O gas. In this design, we consider a spectral band of wavelength from 4.6 μm to 5.6 μm because the absorption wavelength of N₂O gas having the value of 5 μm is suitably matched to this range. In addition, highly birefringent HPC-PCF design is more capable for separating the light polarizations and its high numerical aperture allows strong gathering of light into the core, which further reduces the confinement loss.

本文介绍了用于监测一氧化二氮（N ₂ O）气体的混合多孔芯光子晶体光纤（HPC-PCF）的设计和仿真。利用COMSOL Multiphysics软件和有限元方法完成了设计，数值模拟和优化过程。模拟结果表明，在N = ₂ N气体的吸收波长为λ= 5μm时，相对灵敏度为27％，限制损耗为0.0034 dB / m 。在此设计中，由于N ₂的吸收波长，我们考虑了一个波长范围为4.6μm至5.6μm的光谱带具有5μm的值的O气体适当地匹配于该范围。此外，高度双折射的HPC-PCF设计更能够分离光偏振，其高数值孔径可将光强聚集到纤芯中，从而进一步减少了限制损耗。