Parametric simulations of the metallic double-ring metamaterials: Geometric optimization and terahertz response

Metallic double-ring metamaterial without splits in both of the rings was recently studied to show its negative refraction with magnetic resonance [Z.-G. Dong , Appl. Phys. Lett. 92, 064101 (2008)]. As a consequent work, systematic numerical results are presented in this paper to investigate the dependence of the magnetically resonant transmission on the structural parameters. The origin of the transmission band with magnetic resonance is shown rather explicitly with these numerical results. In addition, the optimized structure of the double-ring metamaterial is used to explore its terahertz response with all the sizes scaled down simultaneously.