Localized subluminal envelope pulses in dispersive media.
The existence and properties of propagative nondispersive and nondiffracting localized envelope waves in dispersive transparent media, with either normal or anomalous group-velocity dispersion, showing subluminal group velocities and strong spatial localization are pointed out. Nonparaxial effects may lead to group-velocity reduction of several orders of magnitude. Numerical simulations are given for wave propagation in sapphire.
Longhi
Stefano
S
Istituto Nazionale per la Fisica della Materia, Dipartimento di Fisica and Istituto di Fotonica e Nanotecnologie-Consiglio Nazionale delle Ricerche, Politecnico di Milano, Piazza L. da Vinci 32, Milan 1-20133, Italy. longhi@fisi.polimi.it