Hannam, Kirsty; Powell, David; Shadrivov, Ilya; Kivshar, Yuri
We study theoretically and experimentally a type of metamaterial with hybrid elements composed of twisted pairs of cross-shaped meta-atoms and their complements. We reveal that such two-layer metasurfaces demonstrate large, dispersionless optical activity at the transmission resonance accompanied by very low ellipticity. We develop a retrieval procedure to determine the effective material parameters for this structure, which has symmetry (C4) of a lower order than other commonly studied chiral...[Show more]
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