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Controlling artificial Pearcey and swallowtail beams allows realizing causticlattices in nonlinear photosensitive media at very low light intensities. Weexamine their functionality as 2D and 3D waveguiding structures, and show thepotential of exploiting these lattices as a linear beam splitter, which we namea Pearcey-Y-splitter. For symmetrized Pearcey beams as auto-focusing beams, theformation of solitons in focusing nonlinearity is observed. Our originalapproach represents the first realization of caustic photonic lattices and candirectly be applied in signal processing, microscopy and material lithography.

Pearcey solitons in curved nonlinear photonic caustic lattices