title: Light bullets in waveguide arrays: spacetime-coupling, spectral symmetry breaking and superluminal decay [Invited].
abstract: We investigate the effects of the space-time coupling (STC) on the nonlinear formation and propagation of Light Bullets, spatiotemporal solitons in which dispersion and diffraction along all dimensions are balanced by nonlinearity, through periodic media with a weak transverse modulation of the refractive index, i.e. waveguide arrays. The STC arises from wavelength dependence of the strength of inter-waveguide coupling and can be tuned by variation of the array geometry. We show experimentally and numerically that the STC breaks the spectral symmetry of Light Bullets to a considerable degree and modifies their group velocity, leading to superluminal propagation when the Light Bullets decay.
authors: Institute of Applied Physics, Abbe Center of Photonics, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, 07743 Jena, Germany. falk.eilenberger@uni-jena.de
authors: Falk
authors: F
authors: Eilenberger
authors: Stefano
authors: S
authors: Minardi
authors: Alexander
authors: A
authors: Szameit
authors: Ulrich
authors: U
authors: Röpke
authors: Jens
authors: J
authors: Kobelke
authors: Kay
authors: K
authors: Schuster
authors: Hartmut
authors: H
authors: Bartelt
authors: Stefan
authors: S
authors: Nolte
authors: Andreas
authors: A
authors: Tünnermann
authors: Thomas
authors: T
authors: Pertsch