Fig. 8From: Chiral metamaterials: enhancement and control of optical activity and circular dichroism3D chiral metamaterials. a Schematic figure (top) and photograph (bottom) of 3D isotropic chiral metamaterials composed of chiral SRR [66]. b Two-dimensional array of metallic helices [39]. c SEM image of 3D bi-chiral photonic crystals composed of dielectric helices [69]Back to article page