Three-Dimensional Light Bullets in Arrays of Waveguides
  We report the first experimental observation of 3D-LBs, excited by femtosecond pulses in a system featuring quasi-instantaneous cubic nonlinearity and a periodic, transversally-modulated refractive index. Stringent evidence of the excitation of LBs is based on time-gated images and spectra which perfectly match our numerical simulations. Furthermore, we reveal a novel evolution mechanism forcing the LBs to follow varying dispersion/diffraction conditions, until they leave their existence range and decay. 
Stefano Minardi, Falk Eilenberger, Yaroslav V. Kartashov, Alexander   Szameit, Ulrich R\"opke, Jens Kobelke, Key Schuster, H...
physics.optics