Structure and Symmetry in Coherent Perfect Polarization Rotation
  Theoretical investigations of different routes to coherent perfect polarization rotation illustrate its phenomenological connection with coherent perfect absorption. Studying systems with broken parity, layering, combined Faraday rotation and optical activity, or a rotator-loaded optical cavity highlights their similarity and suggests new approaches to improving and miniaturizing optical devices. 
Michael Crescimanno, Chuanhong Zhou, James H. Andrews, Michael A.   Baker
physics.optics