Graphene microribbon array on silicon waveguide for sensing applications

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Proceedings of SPIE - The International Society for Optical Engineering
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Marty I.
Bahamon D.A.
Saito L.A.M.
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© 2023 SPIE.The article evaluates a surface plasmon resonance (SPR) sensor that uses a graphene microribbon (GMR) array on a silicon waveguide to detect benzoic acid in terahertz (THz) frequencies. The graphene micro-strips are periodically spaced to excite SPR at THz efficiently. The application of planar waveguide technologies enables the development of miniature and compact multisensor devices that can connect to instrumentation using optical fibers, providing remote operation. Here, the impact of modifying variables such as ribbon width (rw) and the number of ribbons (numrib) are examined for a specific structure of GMR, tuned to EF = 0.45 eV and Γ = 3.7 meV with periodicity Λ = 4 µm, deposited on a silicon waveguide of thickness h = 15 µm and SiO2 substrate. The results show that manipulating these variables enhances the plasmon’s generation but also highly affects the plasmonic modal distribution along the array. The article concludes that the balance between these features can lead to the sensor’s performance optimization. Therefore, changing the analyte refractive index with the acid concentration, a very high sensitivity sensor of 8658 nm/RIU is presented for rw = 3 µm and numrib = 200.
Assuntos Scopus
Graphene microribbon , Micro-strips , Planar-waveguide , Sensing applications , Silicon waveguide , Surface plasmon resonance sensor , Surface-plasmon resonance , Tera Hertz , Terahertz frequencies , Waveguide technology
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