We reveal and observe experimentally significant modifications undertaken by discrete solitons in waveguide lattices upon the continuous transformation of the lattice structure from one-dimensional to two-dimensional. Light evolution and soliton excitation in arrays with a gradually increasing number of rows are investigated, yielding solitons with an effective reduced dimensionality residing at the edge and in the bulk of the lattice.
Szameit, A., Kartashov, Y.V., Dreisow, F., Heinrich, M., Pertsch, T., Nolte, S., Tunnermann, A., Vysloukh, V.A., Lederer, F., Torner, L. Soliton excitation in waveguide arrays with an effective intermediate dimensionality. "Physical review letters", Gener 2009, vol. 102, p. 63902.