Highly birefringent single mode spiral shape photonic crystal fiber based sensor for gas sensing applications

• Main Authors: Md. Ibadul Islam, Bikash Kumar Paul, Kawsar Ahmed, Md. Rabiul Hasan, Sawrab Chowdhury, Md. Shadidul Islam, Shuvo Sen, Ali Newaz Bahar, Sayed Asaduzzaman
• Format: Article
• Language: English
• Published: Elsevier 2017-06-01
• Series: Sensing and Bio-Sensing Research
• Online Access: http://www.sciencedirect.com/science/article/pii/S2214180416301994

This article represents a gas sensor based on spiral photonic crystal fiber (S-PCF) for detecting harmful or colorless gasses and monitoring air pollution by metering gas condensate elements in production facilities. The proposed micro-structured S-PCF contains two layers porous core encircled by a spiral shape cladding. The geometrical parameters are tuned to fix the optimized S-PCF structure. The numerical analysis of the proposed S-PCF is performed by utilizing finite element method (FEM) with circular perfectly match layer (C-PML). The relative sensitivity and birefringence of the recommended structure are 57.61% and 7.53×10−3 respectively at 1.33μm wavelength on the absorption line of toxic gasses (methane and hydrogen fluoride). The exhibited beam divergence is about 4.1° at the same wavelength. Besides, beat length, nonlinear coefficient, effective area and V parameters are also described briefly for optimized S-PCF structure over broader wavelength range from 1μm to 1.8μm. Keywords: Birefringence, Beam divergence, Beat length, Effective area, Gas sensor, Non-linear coefficient, Sensitivity, Spiral photonic crystal fiber