Spoof localized surface plasmons and Fano resonances excited by flared slot line

Abstract

We have investigated spoof localized surface plasmons in the planar textured metallic disk incorporating an efficient and ease-of-integration method. It has been demonstrated that multipolar resonances can be effectively excited and enhanced by flared slot line, which are sensitive to the change of surrounding environment. Experiments at microwave frequencies have been conducted to verify these resonances, showing good agreements to numerical simulations. Multiple Fano resonances have been numerically and experimentally exploited, and it has been shown that strong Fano resonances occur when the corrugated bi-disk structure is vertically excited by flared slot line. Such integrated spoof plasmonic structures could find more applications, such as planar integrated sensing and biological detection at the microwave and terahertz frequencies.