Broadband chiral metamaterials with large optical activity

Kirsty Hannam, David A. Powell, Ilya V. Shadrivov, and Yuri S. Kivshar
Phys. Rev. B 89, 125105 – Published 10 March 2014

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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  • Received 23 January 2014
  • Revised 20 February 2014

DOI:https://doi.org/10.1103/PhysRevB.89.125105

©2014 American Physical Society

Authors & Affiliations

Kirsty Hannam1,*, David A. Powell1, Ilya V. Shadrivov1, and Yuri S. Kivshar1,2

  • 1Nonlinear Physics Center, Research School of Physics and Engineering, Australian National University, Canberra, Australian Capital Territory 0200, Australia
  • 2National Research University of Information Technology, Mechanics and Optics, St. Petersburg 197101, Russia

  • *kirsty.hannam@anu.edu.au

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Issue

Vol. 89, Iss. 12 — 15 March 2014

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