Abstract
Realizing the importance of gas sensors in diversified fields, we address a Fano resonance-based sensor for the detection of greenhouse gases like carbon dioxide, carbon disulfide, and sulfur dioxide. The proposed structure is comprised of metal integrated one-dimensional photonic crystal, where the photonic crystal is designed with an alternate arrangement of SiO2 and Si with a central defect/sample layer. The research's major focus is based on the study of variation of Fano resonance characteristics for different greenhouse gases. Numerous geometrical parameters like the thickness of the sample layer, incident angle, the thickness of the Pt layer, and the number of periods of the photonic crystal are properly optimized to envisage high sensing performances. With the optimized structure, we obtained a maximum sensitivity of 19,740 nm/RIU which is far superior compared to the recently published similar works. Moreover, the simple analysis and cost-effective manufacturing methods make the designed structure a strong contender for gas sensing applications.