title: Giant enhancement of surface second-harmonic generation using photorefractive surface waves with diffusion and drift nonlinearities.
abstract: Giant enhancement of second-harmonic generation (SHG) with 83.4%/W coversion efficiency is obtained, taking advantage of photorefractive surface waves with diffusion and drift nonlinearity. In this method, the self-bending induced by diffusion nonlinearity can be utilized at the surface and can solve the phase-mismatch problem in bulk due to beam self-bending. With drift nonlinearity, an applied external electric filed and background illumination can further constringe surface waves to the surface and consequently enhance SHG, which provides the possibility and flexibility of control.
authors.affiliation: Photonics Research Center, the MOE Key Lab of Weak-Light Nonlinear Photonics, and Tianjin Key Lab of PhotonicsMaterials and Technology for Information Science, Nankai University, Tianjin, China, 300071.
authors.forename: H Z
authors.initials: HZ
authors.lastname: Kang
authors.forename: T H
authors.initials: TH
authors.lastname: Zhang
authors.forename: H H
authors.initials: HH
authors.lastname: Ma
authors.forename: C B
authors.initials: CB
authors.lastname: Lou
authors.forename: S M
authors.initials: SM
authors.lastname: Liu
authors.forename: J G
authors.initials: JG
authors.lastname: Tian
authors.forename: J J
authors.initials: JJ
authors.lastname: Xu