SOI Suspended membrane waveguide at 3.39 µm for gas sensing application




In this letter, we present a numerical study on the designing of silicon-on-insulator (SOI) suspended membrane waveguide (SMW). The waveguide geometry is optimized at 3.39 µm TE-polarized light which is the absorption line of methane gas by utilizing a 3D finite element method (FEM). The transmission loss (TL) and evanescent field ratio (EFR) of the waveguide are calculated for different geometric parameters such as the width of core, the height of core and period of the cladding. We found out that TL is directly related to EFR. Therefore, a waveguide geometry can be designed which can offer high EFR at the cost of high TL or low EFR with low TL, as desired. Based on the geometric parameters used in this paper, we have obtained a TL and EFR which lies in the range of 1.54 dB-3.37 dB and 0.26-0.505, respectively.

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Author Biography

Muhammad Ali Butt, Samara National Research University, Russia

Muhammad Ali Butt was born in 1985. He received the Ph.D. degree in material sciences from Universitat Rovira i Virgili, Spain, in 2015. In 2013, he made a research stay with the Optoelectronic Research Centre (ORC), University of Southampton, U.K. In 2018, he was a Research Assistant Professor with Nicolaus Copernicus University, Poland. He currently works as a Senior Scientist with Samara National Research University, Russia and Warsaw University of Technology, Poland. His research interests are optical waveguides, plasmonic sensors, photonic sensors, diffractive optics, and optical filters.




How to Cite

M. A. Butt and N. L. Kazansky, “SOI Suspended membrane waveguide at 3.39 µm for gas sensing application”, Photonics Lett. Pol., vol. 12, no. 2, pp. 67–69, Jul. 2020.