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Loop-Terminated Mach-Zehnder Interferometer Integrated with Functional Polymer for CO2 Gas Sensing
Version 1
: Received: 27 May 2024 / Approved: 28 May 2024 / Online: 28 May 2024 (11:58:53 CEST)
A peer-reviewed article of this Preprint also exists.
Butt, M.A. Loop-Terminated Mach–Zehnder Interferometer Integrated with Functional Polymer for CO2 Gas Sensing. Appl. Sci. 2024, 14, 4714. Butt, M.A. Loop-Terminated Mach–Zehnder Interferometer Integrated with Functional Polymer for CO2 Gas Sensing. Appl. Sci. 2024, 14, 4714.
Abstract
In this work, a numerical study on the loop-terminated Mach-Zehnder interferometer (LT-MZI) structure for CO2 gas sensing application 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 the transmission spectrum of the device. The sensitivity of the device is estimated at 7.63 pm/ppm, 34.46 pm/ppm and 74.78 pm/ppm for the sensing arm length of 5 µm, 10 µm, and 15 µm, respectively. The sensitivity can be further enhanced, however at the cost of the bigger footprint of the device. Utilizing the innovative sensor design, a comprehensive range of CO2 gas concentrations spanning from 0 to 524 ppm is successfully detected. This compact and highly sensitive device serves as a vital tool for monitoring indoor CO2 levels, fostering a healthier breathing environment for all occupants.
Keywords
Loop-terminated Mach-Zehnder interferometer; Gas sensor; Integrated photonic; Sili-con-on-insulator; polyhexamethylene biguanide
Subject
Physical Sciences, Optics and Photonics
Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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