Klein tunneling of light in waveguide superlattices F. Dreisow, R. Keil, A. Tünnermann, S. Nolte, S. Longhi and A. Szameit EPL, 97 1 (2012) 10008 Published online: 03 January 2012 DOI: 10.1209/0295-5075/97/10008