Multiple Fano Resonance with Excellent Sensing in Rake-Shaped Graphene Nanostructure

Abstract

This study introduces a rake-shaped graphene nanostructure and investigates multiple Fano resonances and its sensing application by using finite-difference time-domain (FDTD) simulations method. Here, the dependence of structural parameters, Fermi levels, and the incidence angle and polarization of the input wave on optical transmission spectra is aimed at investigating. The results show that tunable multiple Fano resonances can be achieved in the rake-shaped graphene nanostructure. In addition, the sensing characteristics based on the multi-Fano resonance in rake-shaped graphene nanostructure are also studied in the work. The research results show that the sensing sensitivity and figure of merit (FOM) can reach up to 2.1 THz/RIU and 3.3/RIU as a result of enhanced interaction between environmental substances and optical waves. These findings deepen the understanding of plasmonic resonances in graphene-based metasurfaces and emphasize their significant potential in sensing applications.