Abstract
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 () of a lower order than other commonly studied chiral structures. We verify our theoretical approach by reproducing numerical and experimental scattering parameters.
- Received 23 January 2014
- Revised 20 February 2014
DOI:https://doi.org/10.1103/PhysRevB.89.125105
©2014 American Physical Society