Toroidal Resonances in Graphene Metamaterials

Toroidal dipoles, unlike electric and magnetic dipoles, are formed due to currents flowing on the surface of a torus along it's meridians. Using numerical simulations, we investigate toroidal resonances in a graphene based 2D terahertz metamaterial structure. We further examine the effect of symmetric split gaps on the toroidal resonance response in the proposed metamerial structure. The excitation and control of toroidal resonance can be significant in the design of modulators, filters and sensors.