Naether, UtaUtaNaetherRojas-Rojas, SantiagoSantiagoRojas-RojasMartínez, Alejandro J.Alejandro J.MartínezStützer, SimonSimonStützerTünnermann, AndreasAndreasTünnermannNolte, StefanStefanNolteMolina, Mario I.Mario I.MolinaVicencio, Rodrigo A.Rodrigo A.VicencioSzameit, AlexanderAlexanderSzameit2022-03-042022-03-042013https://publica.fraunhofer.de/handle/publica/23164810.1364/OE.21.000927We show, numerically and experimentally, that the presence of weak disorder results in an enhanced energy distribution of an initially localized wave-packet, in one- and two-dimensional finite lattices. The addition of a focusing nonlinearity facilitates the spreading effect even further by increasing the wave-packet effective size. We find a clear transition between the regions of enhanced spreading (weak disorder) and localization (strong disorder).en620621journal article