Abstract
Light bullets, solitarily propagating spatiotemporal waves recently observed in a two-dimensional waveguide array, are complex solitons. For the first time, scientists observe and investigate vortex light bullets---stably bound and propagating triplets of light bullets with an energy vortex at their centers.
Highlights
Solitary waves [1,2] are among the most fascinating nonlinear wave phenomena
We report the first experimental observation of vortex light bullets that are discrete, spatiotemporal, solitary waves with orbital angular momentum
It does not include the higher-order effects discussed below, which are needed to understand the full dynamics of vortex light bullet (VLB), but it is a helpful tool to understand the basic mechanisms of VLB propagation and stability
Summary
Solitary waves [1,2] are among the most fascinating nonlinear wave phenomena They constitute wave packets that are immune to linear broadening induced by dispersion and/or diffraction and are of strictly finite energy. As opposed to previous works, it is fully self-confined along all spatial and temporal transverse dimensions It was predicted in the 1990s [30] but eluded observation [31] until recent breakthroughs in modeling [32,33], sample fabrication [34,35], and analysis techniques [36,37] could be brought to bear, immediately bringing forward new spatiotemporal effects such as self-induced soliton decay, direct space-time coupling, and superluminal decay [38,39]. We present evidence of its experimental observation and use experimental and numerical data to explore its internal dynamics, which is characterized by an intricate balance of angular momentum, discreteness, nonlinearity, and the dispersive properties of the medium
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