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This paper describes a gas detection sensor that is based on a microstructured-core photonic crystal fiber (PCF). The finite element method (FEM) is used to analyze the quantitative dependence of guiding properties on geometrical parameters along wavelength. The result shows that the structure provides high relativity sensitivity with minimal confinement loss for detecting various gases such as methane (CH ₄ ) and hydrogen fluoride (HF) because the proposed PCF introduces microstructured-core. According to the results of this simulation, an absorptive line of CH ₄ /HF gases could have a maximum relative sensitivity of about 44.47% at wavelength of with the optimal design of the PCF. The proposed sensor has a confinement loss of around dB/m, that is very low and suitable for use as a gas sensor. Furthermore, numerical aperture (NA), V-parameter, Marcuse spot size (MSS), and beam …