title: Passive system with tunable group velocity for propagating electrical pulses from sub- to superluminal velocities.
abstract: We report an observation of tunable group velocity from sub-luminal to superluminal in a completely passive system. Electric pulses are sent along a spatially periodic conducting medium containing a punctual nonlinearity, and the resulting amplitude-dependent phase shift allows us to control dispersion and the propagation velocity at the stop band frequency.
authors.affiliation: Département de Physique et d'Astronomie, Université de Moncton, Moncton, New Brunswick, Canada E1A 3E9.
authors.forename: Alain
authors.initials: A
authors.lastname: Haché
authors.forename: Sophie
authors.initials: S
authors.lastname: Essiambre