Reconfigurable directional couplers and junctions optically induced by   nondiffracting Bessel beams
  We put forward the concept of reconfigurable structures optically induced by mutually incoherent nondiffracting Bessel beams in Kerr-type nonlinear media. We address collinear couplers and X-junctions, and show how the switching properties of such structures can be tuned by varying the intensity of the Bessel beams. 
Zhiyong Xu, Yaroslav V. Kartashov, Victor A. Vysloukh, Lluis Torner