Robust ultrashort light bullets in strongly twisted waveguide arrays

Abstract

We introduce a new class of stable light bullets that form in twisted waveguide arrays pumped withultrashort pulses, where twisting offers a powerful knob to tune the properties of localized states.We find that above a critical twist, three-dimensional wavepackets are unambiguously stabilized,with no minimum energy threshold. As a consequence, when the higher order perturbations thataccompany ultrashort pulse propagation are at play, the bullets dynamically adjust and sweep alongstable branches. Therefore, they are predicted to feature an unprecedented experimental robustness.

6 pages, 5 figures (to appear in Physical Review Letters)