Finite-energy accelerating beam dynamics in wavelet-based representations

TL;DR

This paper explores the dynamics of finite-energy accelerating beams using wavelet analysis, revealing their origin from self-interference and identifying modes responsible for acceleration, with applications in detecting nonlinear solitons.

Contribution

It introduces a wavelet-based method combined with a Madelung transformation to analyze accelerating beam dynamics and derives general acceleration formulas for higher-order beams.

Findings

Identified modes responsible for beam acceleration.

Demonstrated wavelet transform for detecting nonlinear solitons.

Linked beam properties to vanishing self-interference phenomena.

Abstract

Accelerating beams are wave packets which appear to spontaneously accelerate without external potentials or applied forces. Since their first physical realisation in the form of Airy beams, they have found applications on various platforms, spanning from optics to plasma physics. We investigate the dynamics of examples of finite-energy accelerating beams derived from catastrophe theory. We use a Madelung transformation in momentum-space, combined with a wavelet transformed analysis, to demonstrate that the beams' properties arise from a special type of vanishing self-interference. We identify the modes responsible for the wave packet's acceleration and we derive the general acceleration for higher-order cupsoid-related beams. We also demonstrate how bright solitons resulting from nonlinear Airy beams can be unambiguously detected using the wavelet transform. This methodology will allow for a better understanding of nontrivial wave packet dynamics.