Soliton stripes in two-dimensional nonlinear photonic lattices

We study experimentally the interaction of a soliton with a nonlinear lattice. We observe the formation of a novel type of composite soliton created by strong coupling of mutually incoherent periodic and localized beam components. By imposing an initial transverse momentum on the soliton stripe, we observe the effect of lattice compression and deformation.Comment: three pages, four figure

Self-focusing and filamentation of optical vortex beams: Spatiotemporal analysis

We report numerical simulations supported by experimental observations of self-focusing, fillamentation, and supercontinuum generation by an optical vortex beam in a Kerr nonlinear medium in the regime of dominating nonlinearity. Despite the strong self-focusing resulting in multiple filaments ordered along the vortex ring the optical vortex remains well preserved at the exit of the nonlinear medium and in the far-field. The presented quasi-(3+1)- dimensional numerical simulations under azimuthal initial vortex ring perturbations confirm qualitatively the experimentally observed survival of the optical vortex in the course of the white light generation

Soliton spiraling in optically-induced rotating Bessel lattices

We address soliton spiraling in optical lattices induced by multiple coherent Bessel beams and show that the dynamical nature of such lattices make them able to drag different soliton structures, setting them into rotation. The rotation rate can be controlled by varying the topological charges of lattice-inducing Bessel beams.Comment: 10 pages, 4 figures, to appear in Optics Letter

Discrete interband mutual focusing in nonlinear photonic lattices

We study nonlinear coupling of mutually incoherent beams associated with different Floquet-Bloch waves in a one-dimensional optically-induced photonic lattice. We demonstrate experimentally how such interactions lead to asymmetric mutual focusing and, for waves with opposite diffraction properties, to simultaneous focusing and defocusing as well as discreteness-induced beam localization and reshaping effects.Comment: 8 pages, 6 figures. To download the associated .avi movie, go to http://www.rsphysse.anu.edu.au/~crr124/mut_focus

BEARING CAPACITY FOR RECTANGULAR REINFORCED CONCRETE SECTIONS, SUBJECTED TO BIAXIAL BENDING AND ALL-SIDED FIRE EXPOSURE ACCORDING METHOD „ISOTHERM 500°C” IN BDS EN 1992-1-2

Based on the presented simplified calculation method „Isotherm 500°C” in BDS EN 1992-1-2 is a composed procedure for determining the fire resistance of reinforced concrete rectangular sections of columns, subject of all-sided fire exposure. Conclusions and recommendations are made for practical application.Based on the presented simplified calculation method „Isotherm 500°C” in BDS EN 1992-1-2 is a composed procedure for determining the fire resistance of reinforced concrete rectangular sections of columns, subject of all-sided fire exposure. Conclusions and recommendations are made for practical application

PRACTICAL WAY FOR DETERMINING THE FIRE RESISTANCE OF SQUARE REINFORCED CONCRETE SECTIONS WITH A SYMMETRICAL REINFORCEMENT, SUBJECTED TO BIAXIAL BENDING AND ALL-SIDED FIRE EXPOSURE

Beams and plates in reinforced concrete structures, subjected to internal, edge and corner columns to biaxial bending. Based on the simplified calculation method, “Isotherm 500°C,” in BDS EN 1992-1-2, are composed normalized interaction curves (nomograms) for determining the fire resistance of reinforced concrete square columns, subject of all-sided fire exposure. The nomograms are drawn up for columns, reinforced with four longitudinal bars at the corners of the section. Conclusions and recommendations are made for the practical application of the nomograms.Beams and plates in reinforced concrete structures, subjected to internal, edge and corner columns to biaxial bending. Based on the simplified calculation method, “Isotherm 500°C,” in BDS EN 1992-1-2, are composed normalized interaction curves (nomograms) for determining the fire resistance of reinforced concrete square columns, subject of all-sided fire exposure. The nomograms are drawn up for columns, reinforced with four longitudinal bars at the corners of the section. Conclusions and recommendations are made for the practical application of the nomograms

Nonlinear wave mixing in semiconductor nanoantennas and metasurfaces

We demonstrate how ultra-small dielectric nanoantennas ordered in a metasurface can enable enhanced light matter interaction for efficient nonlinear wave-mixing and in particular, to enhance sum-frequency generation and spontaneous parametric down conversion

Nonlinear Bloch-wave interaction and Bragg scattering in optically-induced lattices

We study, both theoretically and experimentally, the Bragg scattering of light in optically-induced photonic lattices and reveal the key physical mechanisms which govern nonlinear self-action of narrow beams under the combined effects of Bragg scattering and wave diffraction, allowing for selecting bands with different effective dispersion.Comment: 4 pages, 6 figure

Soliton control in modulated optically-induced photonic lattices

We discuss soliton control in reconfigurable optically-induced photonic lattices created by three interfering beams. We reveal novel dynamical regimes for strongly localized solitons, including binary switching and soliton revivals through resonant wave mixing.Comment: 7 pages, 5 figures. Content modifie