Near-Field Coupled Toroidal Metasurfaces Based on ‘All’ Bright Resonators Framework

Abstract

We demonstrate a multiple split-ring resonator based metasurface that exhibits bright mode-bright mode coupling in the Terahertz regime, leading to strong mode-hybridization assisted near-field coupling in the structure. Further, we show the emergence of antiparallel toroidal modes due to the near-field coupling amongst the constituent ‘bright’ mode resonators.