Nonlocal communication with photoinduced structures at the surface of a   polymer film
  Nonlocal communication between two laser light beams is experimented in a photochromic polymer thin films. Information exchange between the beams is mediated by the self-induction of a surface relief pattern. The exchanged information is related to the pitch and orientation of the grating. Both are determined by the incident beam. The process can be applied to experiment on a new kind of logic gates. 
R. Barille, S. Dabos-Seignon, J. -M. Nunzi, S. Ahmadi Kandjani, E.   Ortyl and S. Kucharski