title: Conical second harmonic generation in a two-dimensional chi(2) photonic crystal: a hexagonally poled LiTaO3 crystal.
abstract: A new type of conical second-harmonic generation was discovered in a 2D chi((2)) photonic crystal-a hexagonally poled LiTaO3 crystal. It reveals the presence of another type of nonlinear interaction-a scattering involved optical parametric generation in a nonlinear medium. Such a nonlinear interaction can be significantly enlarged in a modulated chi((2)) structure by a quasi-phase-matching process. The conical beam records the spatial distribution of the scattering signal and discloses the structure information and symmetry of the 2D chi((2)) photonic crystal.
authors.affiliation: National Laboratory of Solid State Microstructures, Nanjing University, Nanjing, 210093, China.
authors.forename: P
authors.initials: P
authors.lastname: Xu
authors.forename: S H
authors.initials: SH
authors.lastname: Ji
authors.forename: S N
authors.initials: SN
authors.lastname: Zhu
authors.forename: X Q
authors.initials: XQ
authors.lastname: Yu
authors.forename: J
authors.initials: J
authors.lastname: Sun
authors.forename: H T
authors.initials: HT
authors.lastname: Wang
authors.forename: J L
authors.initials: JL
authors.lastname: He
authors.forename: Y Y
authors.initials: YY
authors.lastname: Zhu
authors.forename: N B
authors.initials: NB
authors.lastname: Ming