Theoretical analysis of porous silicon one-dimensional photonic crystal doped with magnetized cold plasma for hazardous gases sensing applications

This paper exhibits a detailed theoretical analysis of a photonic crystal as a gas sensor for detecting various hazardous greenhouse gases and chemicals under the influence of an external magnetic field. The backbone of the present work lies in the study of the shifting nature of the defect mode characteristics with respect to the change in the refractive index of the sample layer. The designed structure's geometrical parameters are judiciously optimized to accomplish the best sensing results. Simulation upshots revealed a remarkable sensitivity of 16.35 GHz/refractive index unit (RIU), a figure of merit of 1.4×105\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$1.4\times {10}^{5}$$\end{document} 1/RIU, a quality factor of 4.7×104\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$4.7\times {10}^{4}$$\end{document}, and limit of detection of 3.5×10-7\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$3.5\times {10}^{-7}$$\end{document} RIU.