Scattering properties of PT-symmetric objects
  We investigate the scattering response of parity-time (PT) symmetric structures. We show that, due to the local flow of energy between gain and loss regions, such systems can deflect light in unusual ways, as a function of the gain/loss contrast. Such structures are highly anisotropic and their scattering patterns can drastically change as a function of the angle of incidence. In addition, we derive a modified optical theorem for PT-symmetric scattering systems, and discuss its ramifications. 
Mohammad-Ali Miri, Mohammad Amin Eftekhar, Margarida Facao, Ayman F.   Abouraddy, Ahmed Bakry, Mir A. N. Razvi, Ahmed Alshah...
physics.optics