Asymmetric left-handed metamaterial in microwave and infra-red regimes at normal incidence

In this paper, we first present the near infra-red prototype fabricated at the IEF together with the simulation and measurement results. Then, we compare this metamaterial with a bi-layer one used in the microwave regime by Ozbay et al. (2006), that we propose to transform towards an asymmetric mono-layer structure. This mono-layer structure coincides with our fabricated structure when the lateral legs of the resonators are removed. It shows several advantages compared to published structures; it works at normal incidence and is relatively simple to fabricate in infra-red. Its fabrication in the visible region can then be considered.