Multiple Fano Resonances Structure for Terahertz Applications

Abstract

A new planar engineered material structure, which has multiple Fano resonances at the terahertz range of frequency, is presented. Starting with a double Fano resonance structure, it is shown that by considering several unit cells as a larger unit cell and creating new asymmetries in the supercell, we can have five Fano resonances in one structure. Analysis of current distributions at resonance frequencies clarifies the origin of different resonances. We show that all of these resonances come from different arrangement of magnetic dipoles.

Experimental demonstration of multiple Fano resonances in a mirrored array of split-ring resonators on a thick substrate

“…While single Fano resonance arises from combining one bright mode and one dark mode, combining a bright mode with several dark modes can result in several Fano resonances. Multiple Fano resonances are created by introducing new asymmetries into a planar periodic structure 6 , collective excitation of a metamolecule lattice consisting of two different metamaterial resonators 7 , by coupling between the surface plasmon-polariton mode and multi-order planar waveguide modes 8 . Multiple Fano resonances in metal–insulator-metal waveguide structures with different shapes of cavities 9 have attracted the attention of many researchers due to their outstanding features, including ease of integration and deep subwavelength confinement of light in the visible and near-infrared wavelengths.…”