Circular dichroism induced by Fano resonances in planar chiral oligomers
  We present a general theory of circular dichroism in planar chiral nanostructures with rotational symmetry. It is demonstrated, analytically, that the handedness of the incident field's polarization can control whether a nanostructure induces either absorption or scattering losses, even when the total optical loss (extinction) is polarization-independent. We show that this effect is a consequence of modal interference so that strong circular dichroism in absorption and scattering can be engineered by combining Fano resonances with planar chiral nanoparticle clusters. 
Ben Hopkins, Alexander N. Poddubny, Andrey E. Miroshnichenko and Yuri   S. Kivshar
physics.optics