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In this paper, experimental observation of Landau-Zener tunnelling in optically induced hexagonal photonic lattices by studying symmetric and asymmetric three-fold resonances is reported. Because of the fixed length of the photorefractive crystal, the dynamics of the propagating beam is traced by changing the input tilt angle of the probe Gaussian beam, i.e. its initial position in Fourier space relative...
We review the fundamentals of light control in nonlinear periodic photonic lattices. In particular, we demonstrate their ability to control the modulational instability and pattern formation in a nonlinear dissipative feedback system.
In this work, the authors demonstrated experimentally the suppression of instabilities of counterpropagating solitons in one (1D) and two-dimensional (2D) periodic photonic lattices. We study the dependence of the soliton instability on the lattice depth and periodicity and identify optimal parameters for stabilisation.
We generate surface gap solitons with staggered phase structure at the edge of a semi-infinite LiNbO3 waveguide array with defocusing nonlinearity. We characterize self- localization dynamics and identify the threshold power for soliton formation.
We report on the experimental observation of nonlinear localization of light in azimuthally modulated Bessel photonic lattices. These lattices are optically induced in a photorefractive crystal and resemble multiple-core highly nonlinear microstructure fibers.
We report on the first observation of surface gap solitons, a nonlinear optical analog of localized surface Tamm states in periodic electronic potentials. We demonstrate strong beam self-trapping in the form of staggered surface modes at the interface between uniform and periodic dielectric media with defocusing nonlinear response.
We observe experimentally nonlinear localization of beams in two-dimensional modulated Bessel-type photonic lattices with self-focusing nonlinear response.
We demonstrate experimentally all-optical beam steering in modulated photonic lattices produced by three wave interference in photorefractive crystals. We show that high spatial resolution can be achieved by combining dynamic beam steering with nonlinear self-localization.
We predict, in the framework of a nonlinear discrete model, and demonstrate experimentally in defocusing waveguide arrays, that self-localization near the edge of a photonic lattice can result in the formation of surface gap solitons.
We predict a sharp crossover from self-defocusing to discrete localization in photonic lattices with defocusing nonlinearity for increasing index contrast. We demonstrate experimentally discrete self-trapping of light by single site excitation in LiNbO3 waveguide arrays.
We demonstrate theoretically and experimentally directional wave transport in two-dimensional perfectly periodic photonic structures. This effect is associated with the anisotropic mobility of nonlinear localized modes formed by the combined effects of total-internal and Bragg reflection.
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