PT-Symmetric Talbot Effects
  We show that complex PT-symmetric photonic lattices can lead to a new class of self-imaging Talbot effects. For this to occur, we find that the input field pattern, has to respect specific periodicities which are dictated by the symmetries of the system. While at the spontaneous PT-symmetry breaking point, the image revivals occur at Talbot lengths governed by the characteristics of the passive lattice, at the exact phase it depends on the gain and loss parameter thus allowing one to control the imaging process. 
Hamidreza Ramezani (1), D. N. Christodoulides (2), V. Kovanis (3), I.   Vitebskiy (3) and Tsampikos Kottos (1 and 4) ((1) De...
physics.optics cond-mat.other quant-ph