Standard slot waveguide and double hybrid plasmonic waveguide configurations for enhanced evanescent field absorption methane gas sensing




Slot waveguide, hybrid plasmonic waveguide, gas sensor


Herein, a numerical study on standard slot waveguide and double hybrid plasmonic waveguide based on a silicon-on-insulator platform is presented. The geometric parameters of both the waveguides are optimized for the operational wavelength of 3.39 μm (absorption line of methane gas) to obtain the maximum evanescent field ratio (EFR). By utilizing Lambert-Beer’s law, the gas sensing capability of both the waveguides is determined. It is found out that both the waveguides of length 100 μm offer high EFR resulting in the 3dB decay of the propagating mode power for the methane gas concentration of 20-22 % in the chamber. The study provides the foundation for the practical realization of compact and highly sensitive gas sensors.

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Author Biography

Muhammad Ali Butt, Samara National Research University, Russia Warsaw University of Technology, Poland

Muhammad Ali Butt (b. 1985) received his PhD degree in Material Sciences from Universitat Rovira i Virgili, Spain in the year 2015. In 2018, he worked at Nicolaus Copernicus University, Poland as a Research Assistant Professor. In 2013, he made a research stay at Optoelectronic Research Centre (ORC), University of Southampton, England. Currently, he works as a Senior Scientist at Samara National Research University, Russia. Research interests are optical waveguides, plasmonic sensors, diffractive optics, and optical filters. E-mail:




How to Cite

Butt, M. A., & Piramidowicz, R. (2022). Standard slot waveguide and double hybrid plasmonic waveguide configurations for enhanced evanescent field absorption methane gas sensing. Photonics Letters of Poland, 14(1), 10–12.