Abstract
We demonstrate theoretically that the analogue of electromagnetically induced transparency (EIT) in two orthogonal directions can be achieved in a planar metamaterial consisting of spiral resonators and split ring resonators in the same plane. The metamaterial can exhibit EIT-like effect to both normally and laterally incident electromagnetic waves because of its electric and magnetic response, respectively. Full-wave numerical simulations are carried out to validate the EIT-like effect of the planar metamaterial. Absorption curves, transmission spectra, surface current distributions and effective constitutive parameters of the metamaterial illuminated by normally and laterally incident EM waves are presented. These results, showing a transparency window with extremely low absorption and strong dispersion, are in good agreement with each other.
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