Abstract:
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We put forward a new approach to generate stable, fully three-dimensional light bullets, which is based
on the matching of the intrinsic material dispersion with a suitable effective diffraction. The matching is
achieved in adequate waveguide arrays whose refractive index is periodically modulated along the
direction of light propagation. We show that by using nonconventional, out-of-phase longitudinal
modulation of the refractive index of neighboring channels, it is possible to tune the effective diffraction
to match the intrinsic material group velocity dispersion. Three-dimensional light bullets are shown to
form at reduced energy levels, in settings where the dispersion would be far too weak to generate bullets in
the absence of array. |