Hybrid porous core photonic crystal fiber sensor for monitoring nitrous oxide gas

摘要

This paper presents the design and simulation of hybrid porous core photonic crystal fiber (HPC-PCF) for monitoring nitrous oxide (N 2 O) 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 N 2 O gas. In this design, we consider a spectral band of wavelength from 4.6?μm to 5.6?μm because the absorption wavelength of N 2 O 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.