title: Generation of Bessel beams by parametric frequency doubling in annular nonlinear periodic structures.
abstract: We analyze the second-harmonic generation in two-dimensional photonic structures with radially periodic domains created by poling of a nonlinear quadratic crystal. We demonstrate that the parametric conversion of the Gaussian fundamental beam propagating along the axis of the annular structure leads to the axial emission of the second-harmonic field in the form of the radially polarized first-order Bessel beam.
authors.forename: Solomon
authors.initials: S
authors.lastname: Saltiel
authors.forename: Wieslaw
authors.initials: W
authors.lastname: Krolikowski
authors.forename: Dragomir
authors.initials: D
authors.lastname: Neshev
authors.forename: Yuri S
authors.initials: YS
authors.lastname: Kivshar