Dreisow, FelixFelixDreisowKeil, RobertRobertKeilTünnermann, AndreasAndreasTünnermannNolte, StefanStefanNolteLonghi, StefanoStefanoLonghiSzameit, AlexanderAlexanderSzameit2022-03-042022-03-042012https://publica.fraunhofer.de/handle/publica/22795310.1209/0295-5075/97/10008We present an experimental observation of Klein tunneling of light waves in lattices of evanescently coupled waveguides with a superimposed potential step. The incident wave packet "mass" which is a characteristic feature of Klein tunneling is generated by a minigap in the band structure of the lattice. We studied different masses and measured the tunneling rates across the potential step.en620530journal article