Loop-Terminated Mach–Zehnder Interferometer Integrated with Functional Polymer for CO2 Gas Sensing
Muhammad A. Butt
Abstract:In this work, a numerical study on the loop-terminated Mach–Zehnder interferometer (LT-MZI) structure for CO2 gas sensing applications is carried out via the finite element method. The sensing arm is covered with a polyhexamethylene biguanide (PHMB) polymer which is highly receptive to CO2 gas. The refractive index of the host material decreases due to the absorption of the CO2 gas resulting in a shift in the interference pattern of the LT-MZI structure. As a result, a redshift in the wavelength is observed in… Show more
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