Broadband chiral metamaterials with large optical activity

Kirsty Hannam; David A. Powell; Ilya V. Shadrivov; Yuri S. Kivshar

doi:10.1103/PhysRevB.89.125105

Broadband chiral metamaterials with large optical activity

Kirsty Hannam, David A. Powell, Ilya V. Shadrivov, Yuri S. Kivshar

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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 (C4) of a lower order than other commonly studied chiral structures. We verify our theoretical approach by reproducing numerical and experimental scattering parameters.

Original language	English
Article number	125105
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	89
Issue number	12
DOIs	https://doi.org/10.1103/PhysRevB.89.125105
Publication status	Published - 10 Mar 2014

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10.1103/PhysRevB.89.125105

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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 (C4) of a lower order than other commonly studied chiral structures. We verify our theoretical approach by reproducing numerical and experimental scattering parameters.",

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AB - 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 structures. We verify our theoretical approach by reproducing numerical and experimental scattering parameters.

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Broadband chiral metamaterials with large optical activity

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