Paper Title
Arrays of Bimetallic Au-Si Nanorings for Efficient Plasmonic Switching

Abstract
In this paper,we have demonstratedsilicon-filledgold nano-ring arrays arranged in a periodic manner on a 60 nm thick layer of vanadium dioxidesituated between the nanostructures and the underlying gold-coatedSiO2 substrate. The periodic arrays of silicon-filled gold nano-ringswith a small gap betweensubsequent rings induces coupled interactions among thesenano-rings. When subjected to external factors such as temperature, electric fields, or radiation, vanadium dioxide film transitions from a semiconducting state to a metallic state. This phase change alters the structure's reflectance spectra, enabling optical switching. Finite Difference Time Domain (FDTD) numerical modelling is used to show that an Extinction Ratio (ER) of around23 dB can be simultaneously obtained at more than one wavelength using thesering-shapedswitches. Further, it is also demonstrated that the resonant wavelength of maximum ER can be varied by modifying the geometrical parameters of the switch, such as the ratio ofinner radius (R2), the height (H), and the VO2 layer thickness (t). These switches haveimmense usage in communication applications. Keywords - Plasmonics, Phase Change Materials, VO2, Multiwavelength Switches