title: Lattice surface solitons in diffusive nonlinear media driven by the quadratic electro-optic effect.
abstract: We study theoretically surface lattice solitons driven by quadratic electro-optic effect at the interface between an optical lattice and diffusive nonlinear media with self-focusing and self-defocusing saturable nonlinearity. Surface solitons originating from self-focusing nonlinearity can be formed in the semi-infinite gap, and are stable in whole domain of their existence. In the case of self-defocusing nonlinearity, both surface gap and twisted solitons are predicted in first gap. We discover that surface gap solitons can propagate stably in whole existence domain except for an extremely narrow region close to the Bloch band, and twisted solitons are linearly unstable in the entire existence domain.
authors.forename: Kaiyun
authors.initials: K
authors.lastname: Zhan
authors.forename: Chunfeng
authors.initials: C
authors.lastname: Hou