Observation of two-dimensional lattice interface solitons
A. Szameit, Y. V. Kartashov, F. Dreisow, M. Heinrich, V. A. Vysloukh,, T. Pertsch, S. Nolte, A. Tunnermann, F. Lederer, L. Torner

TL;DR
This paper reports the experimental discovery of two-dimensional lattice interface solitons at the boundary between square and hexagonal waveguide arrays, highlighting how lattice symmetry and refractive index modulation influence soliton properties.
Contribution
First experimental observation of 2D lattice interface solitons at square-hexagonal boundary, analyzing effects of lattice symmetry and refractive index variation.
Findings
Surface solitons are observed at the interface.
Refractive index modulation depth significantly affects soliton properties.
Lattice symmetry influences the behavior of interface solitons.
Abstract
We report on the experimental observation of two-dimensional solitons at the interface between square and hexagonal waveguide arrays. In addition to the different symmetry of the lattices, the influence of a varying refractive index modulation depth is investigated. Such variation strongly affects the properties of surface solitons residing at different sides of the interface.
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