Mr. Ahmed ElSayed Profile

Ahmed ElSayed

at The American Univ in Cairo

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Proceedings Article | 31 May 2023 Poster + Paper

Design of highly sensitive plasmonic nanoantenna mid-IR gas sensor

Ahmad Alsayed, AbdelRahman Ghanim, Ashraf Yahia, Mohamed Swillam

Proceedings Volume 12575, 125750G (2023) https://doi.org/10.1117/12.2665253

KEYWORDS: Nanoantennas, Silicon, Refractive index, Mid-IR, Localized surface plasmon resonances, Gas sensors, Silica, Plasmonics, Doping, Dielectrics

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Gas sensing is critical in the detection of hazardous gases in the environment as well as medical disorders. Today the world faces energy and climate challenges which increase the demand for sensors that can sense harmful emissions in surrounding environments and manage fuel exhausts from stationary plants and transportation. Metal-oxide, capacitance, and electrochemical-based gas sensors are among the various gas-detecting techniques. Among these sensing techniques, the optical method is particularly important since it is a quick, dependable, and extremely sensitive way of sens e. Therefore, this research is motivated by a desire to build a nano-optical gas sensor to meet the internet of things (IoT) needs, but on the condition that it is manufactured using CMOS technologies. The plasmonic nanoantenna on-Chip will be used as a gas sensor relying on the dielectric nanoparticles with high refractive index properties which demonstrate high electromagnetic mode coupled with significant localized surface plasmon resonance (LSPR) confined in a nanometric volume. The changing of the refractive index of the surrounding medium will exhibit a shift in the resonance wavelength or affect the peak of the field intensity. The nanoantenna proposed is composed of highly doped silicon and placed on a dielectric layer. We use several nanoantenna models to resonate in the mid-infrared spectrum, where each gas has its fingerprint. The numerical calculations were performed using the Lumerical commercial tool based on the 3D Finite Difference Time Domain (FDTD) approach.

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