title: Discrete diffraction and spatial gap solitons in photovoltaic LiNbO3 waveguide arrays.
abstract: We investigate, experimentally and theoretically, light propagation in one-dimensional waveguide arrays exhibiting a saturable self-defocusing nonlinearity. We demonstrate low-intensity "discrete diffraction", and the high-intensity formation of spatial gap solitons arising from the first band of the transmission spectrum. The waveguide arrays are fabricated by titanium in-diffusion in a photorefractive copper-doped lithium niobate crystal, and the optical nonlinearity arises from the bulk photovoltaic effect.
authors.forename: Feng
authors.initials: F
authors.lastname: Chen
authors.forename: Milutin
authors.initials: M
authors.lastname: Stepić
authors.forename: Christian
authors.initials: C
authors.lastname: Rüter
authors.forename: Daniel
authors.initials: D
authors.lastname: Runde
authors.forename: Detlef
authors.initials: D
authors.lastname: Kip
authors.forename: Vladimir
authors.initials: V
authors.lastname: Shandarov
authors.forename: Ofer
authors.initials: O
authors.lastname: Manela
authors.forename: Mordechai
authors.initials: M
authors.lastname: Segev