Nagarajan P., Jacob Wekalao, Ashokkumar N., Shobhit K. Patel
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Design and Analysis of a Plasmonic Metasurface-Based Graphene Sensor for Highly Sensitive and Label-Free Detection of COVID-19 Biomarkers
This research presents plasmonic metasurface-based graphene sensor for highly sensitive and label-free detection of COVID-19 biomarkers. The proposed sensor structure integrates graphene with specially engineered metasurface resonators for the detection of SARS-CoV-2 biomarkers through analysis of terahertz spectroscopic signatures. Finite element method simulations were performed to optimize the sensor design, including resonator dimensions, angle of incidence, and graphene chemical potential. The optimized sensor demonstrates a maximum sensitivity of 400 GHzRIU−1, a figure of merit of 0.224 RIU−1, a quality factor of 7.942, and a detection limit of 0.465 RIU. Electric field distribution analysis provides insights into the sensor’s plasmonic modes and light-matter interactions. The sensor also shows potential for 2-bit encoding applications. Compared to existing designs, the proposed sensor exhibits superior performance in key metrics like sensitivity among others. This plasmonic metasurface approach presents a promising platform for rapid, sensitive, and specific detection of SARS-CoV-2 and other viral biomarkers, with potential applications in advanced diagnostic tools and public health monitoring.
期刊介绍：
Plasmonics is an international forum for the publication of peer-reviewed leading-edge original articles that both advance and report our knowledge base and practice of the interactions of free-metal electrons, Plasmons.
Topics covered include notable advances in the theory, Physics, and applications of surface plasmons in metals, to the rapidly emerging areas of nanotechnology, biophotonics, sensing, biochemistry and medicine. Topics, including the theory, synthesis and optical properties of noble metal nanostructures, patterned surfaces or materials, continuous or grated surfaces, devices, or wires for their multifarious applications are particularly welcome. Typical applications might include but are not limited to, surface enhanced spectroscopic properties, such as Raman scattering or fluorescence, as well developments in techniques such as surface plasmon resonance and near-field scanning optical microscopy.
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