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Large Chiroptical Effects in Planar Chiral Metamaterials

Weimin Ye1, Xiaodong Yuan1, Chucai Guo1, Jianfa Zhang1, Biao Yang2, and Shuang Zhang2,*

  • 1College of Optoelectronic Science and Engineering, National University of Defense Technology, Changsha 410073, People’s Republic of China
  • 2School of Physics and Astronomy, University of Birmingham, Birmingham B15 2TT, United Kingdom

  • *s.zhang@bham.ac.uk
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Phys. Rev. Applied 7, 054003 – Published 8 May, 2017

DOI: https://doi.org/10.1103/PhysRevApplied.7.054003

Abstract

Chiroptical effects characterized by different optical responses for left- (LCP) and right-handed circularly polarized light (RCP) are powerful and valuable tools in optics with wide applications in polarization-resolved imaging and sensing. Previously observed strong chiroptical effects are limited to metamaterials with complex three-dimensional chiral structures at the subwavelength scale. Although asymmetrical transmission of LCP and RCP have been investigated in planar chiral metasurfaces, the observed weak chiroptical effects result from anisotropic Ohmic dissipation of the metal constituents. Here, we demonstrate by theory and proof-of-concept experiments that a large difference in transmittances of LCP and RCP can be attained in a single-layer planar chiral metamaterial with a subwavelength thickness. Without violating the reciprocity and mirror symmetry, the strong chiroptical effect, independent of dielectric loss, arises from a mechanism of multimode interference. The described effect may lead to a gateway towards chiral manipulations of light and chiral optical devices.

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Phys. Rev. Applied 7, 054003– Published 8 May, 2017
  • Received 19 November 2016

© 2017 American Physical Society

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