Visible Spectrum Circular Dichroism in Extrinsic Chirality Metamaterials
  We present the new planar extrinsic chirality metamaterial (ECM) design that manifests giant circular dichroism (CD) in the visible spectrum range rather than usual near-infrared and terahertz range. Effects of incident beam angles and meta-molecules unit sizes on the CD spectrums were theoretically analyzed; Physical mechanism was illustrated in new figures of asymmetrical current excitation in neighboring unit cells. 
Seoungjun Lee, Zengbo Wang, Cheng Feng, Jiao Jiao, Ashfaq Khan, Lin Li
physics.optics