title: Nondiffracting beams in periodic media.
abstract: We identify nondiffracting beams in two-dimensional periodic systems, exhibiting symmetry properties and phase structure characteristic of the band(s) they are associated with.
authors.affiliation: Department of Physics and Solid State Institute, Technion, Haifa 32000, Israel.
authors.forename: Ofer
authors.initials: O
authors.lastname: Manela
authors.forename: Mordechai
authors.initials: M
authors.lastname: Segev
authors.forename: Demetrios N
authors.initials: DN
authors.lastname: Christodoulides