Topology of a Planar-chiral Iris as a Factor in Controlling the "Optical Activity" of a Bilayer Object

It is shown how the topology of the individual components of a two-layer 3D-chiral object affects the natural frequencies and the manifestation of the "artificial optical activity". Using the waveguide example, it is proved that the dihedral symmetry Dn with high n allows expanding the bandwidth of polarizer.