Figure 2
From: Giant intrinsic chiro-optical activity in planar dielectric nanostructures
Origins of optical chirality. (a–c) Schematic illustrations of the operating principle of a representative a planar extrinsic (pseudo) chiral metasurface, b 3D intrinsic metamaterial and c optically thick planar structure with intrinsic chirality under their respective illumination conditions (red arrows). The insets show magnified views of the structures overlaid with the relative orientations of electric (p, green arrow) and magnetic (m, blue arrow) multipole moments generated under such illumination. These moments are drawn as simple vector arrows for ease of illustration. In a, due to geometrical constraints, the net electric and magnetic moments are always orthogonal. In b and c, the chiral structures can support in-plane magnetic moments (m∥) that have a non-zero component along the direction of the in-plane electric moment (p∥).
