Two-dimensional nonlinear optically induced photonic lattices in photorefractive crystals

Desyatnikov, Anton S.; Neshev, D.; Fischer, Robert; Królikowski, Wiesław; Sagemerten, Nina; Träger, Denis; Denz, Cornélia; Dreischuh, A.; Kivshar, Yuri S.

doi:10.1117/12.648200

Cited by 1 publication

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“…An extension of such vortex ensembles towards large stable regular OV lattices is also analyzed in [27] and studied for the first time experimentally in [28] by using computer-generated holograms (CGHs) which were produced photolithographically. Some of the early theoretical and experimental results for the generation of two-dimensional (2D) nonlinear optically induced photonic lattices, including OV lattices, are reviewed in [29,30]. More recently researchers have demonstrated that a variety of OV lattices can be generated and reconfigured in orientation and structure by a Mach-Zehnder-type of reverse-wavefront folding interferometer with a minimal number of optical elements [31].…”

Section: Introductionmentioning

confidence: 99%

Far-field beam reshaping by manipulating the topological charges of hexagonal optical vortex lattices

Stoyanov

Maleshkov

Zhekova

et al. 2018

J. Opt.

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In this work, we demonstrate experimentally the formation of eight different basic structures consisting of bright beams with flat phase fronts in the focus of a lens (i.e. in the artificial far-field). In all cases considered, the used input structure is a large, stable, hexagon-shaped optical vortex (OV) array composed of vortices with alternating topological charges (TCs). The TCs of one individual OV or of the complete OV lattice were erased/doubled in the cases of perfect superposition (on-site alignment) or are manipulated in phase in the cases of different offsets between the lattice elementary cells (off-site alignments). A dramatic reshaping of the input beam is observed in the far-field and it is shown to be in excellent agreement with the numerical simulations.

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