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  4. Extreme wave excitation from localized phase-shift perturbations
 
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Extreme wave excitation from localized phase-shift perturbations

Publikationstyp
Journal Article
Publikationsdatum
2022-10
Sprache
English
Author
He, Yuchen 
Witt, Andy orcid-logo
Trillo, Stefano 
Chabchoub, Amin 
Hoffmann, Norbert orcid-logo
Institut
Strukturdynamik M-14 
TORE-URI
http://hdl.handle.net/11420/14146
Enthalten in
Physical review E - Covering statistical, nonlinear, biological, and soft matter physics 
Volume
106
Issue
4
Article Number
L043101
Citation
Physical Review E 106 (4): L043101 (2022-10)
Publisher DOI
10.1103/PhysRevE.106.L043101
Scopus ID
2-s2.0-85141614650
The modulation instability is a focusing mechanism responsible for the formation of strong wave localizations not only on the water surface, but also in a variety of nonlinear dispersive media. Such dynamics is initiated from the injection of sidebands, which translate into an amplitude modulation of the wave field. The nonlinear stage of unstable wave evolution can be described by exact solutions of the nonlinear Schrödinger equation (NLSE). In that case, the amplitude modulation of such coherent extreme wave structures is connected to a particular phase-shift seed in the carrier wave. In this Letter, we show that phase-shift localization applied to the background, excluding any amplitude modulation excitation, can indeed trigger extreme events. Such rogue waves can be for instance generated by considering the parametrization of fundamental breathers, and thus by seeding only the local phase-shift information to the regular carrier wave. Our wave tank experiments show an excellent agreement with the expected NLSE hydrodynamics and confirm that even though delayed in their evolution, breather-type extreme waves can be generated from a purely regular wave train. Such a focusing mechanism awaits experimental confirmation in other nonlinear media, such optics, plasma, and Bose-Einstein condensates.
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