title: Observation of modulational instability in discrete media with self-defocusing nonlinearity.
abstract: We report what we believe is the first observation of modulation instability in the anomalous-diffraction regions of a photonic lattice. The experiments were carried out in a 1D waveguide array fabricated in a lithium niobate crystal displaying the photovoltaic self-defocusing nonlinearity, and our results are confirmed numerically by simulating the nonlinear beam propagation.
authors.affiliation: Institute of Physics and Physical Technology, Clausthal University of Technology, Clausthal-Zellerfeld, Germany. milutin.stepic@tuclausthal.de
authors.forename: Milutin
authors.initials: M
authors.lastname: Stepić
authors.forename: Christian
authors.initials: C
authors.lastname: Wirth
authors.forename: Christian E
authors.initials: CE
authors.lastname: Rüter
authors.forename: Detlef
authors.initials: D
authors.lastname: Kip