title: Optically induced transition between discrete and gap solitons in a nonconventionally biased photorefractive crystal.
abstract: We show that optically induced photonic lattices in a nonconventionally biased photorefractive crystal can support the formation of discrete and gap solitons owing to a mechanism that differs from the conventional screening effect. Both the bias direction and the lattice orientation can dramatically influence the nonlinear beam-propagation dynamics. We demonstrate a transition from self-focusing to -defocusing and from discrete to gap solitons solely by adjusting the optical-beam orientation.
authors.affiliation: Institute of Optical Information Science and Technology and Shaanxi Key Laboratory of Optical Information Technology, School of Science, Northwestern Polytechnical University, Xi'an 710072, China.
authors.forename: Peng
authors.initials: P
authors.lastname: Zhang
authors.forename: Sheng
authors.initials: S
authors.lastname: Liu
authors.forename: Jianlin
authors.initials: J
authors.lastname: Zhao
authors.forename: Cibo
authors.initials: C
authors.lastname: Lou
authors.forename: Jingjun
authors.initials: J
authors.lastname: Xu
authors.forename: Zhigang
authors.initials: Z
authors.lastname: Chen