2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/86370A general analysis of undistorted propagation of localized wavepackets in photonic crystals based on a Wannier-function expansion technique is presented. Different kinds of propagating and stationary spatio-temporal localized waves are found from an asymptotic analysis of the Wannier function envelope equation.4 pages, no figures (submitted for publication)OpticsAtomic Physicstext