Solitary waves, steepening and initial collapse in the Maxwell-Lorentz system

Publication: Research - peer-reviewJournal article – Annual report year: 2002

  • Author: Sørensen, Mads Peter

    Department of Informatics and Mathematical Modeling, Technical University of Denmark, Denmark

  • Author: Brio, Moysey

    Department of Mathematics, Arizona Center for Mathematical Sciences, University of Arizona, Tucson, AZ 85721, USA

  • Author: Webb, Garry

    Institute of Geophysics and Planetary Physics, University of California Riverside, Riverside CA 92521, USA

  • Author: Moloney, Jerome V.

    Department of Mathematics, Arizona Center for Mathematical Sciences, University of Arizona, Tucson, AZ 85721, USA

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We present a numerical study of Maxwell's equations in nonlinear dispersive optical media describing propagation of pulses in one Cartesian space dimension. Dispersion and nonlinearity are accounted for by a linear Lorentz model and an instantaneous Kerr nonlinearity, respectively. The dispersion relation reveals various asymptotic regimes such as Schrödinger and KdV branches. Existence of soliton-type solutions in the Schrödinger regime and light bullets containing few optical cycles together with dark solitons are illustrated numerically. Envelope collapse regimes of the Schrödinger equation are compared to the full system and an arrest mechanism is clearly identified when the spectral width of the initial pulse broadens beyond the applicability of the asymptotic behavior. We show that beyond a certain threshold the carrier wave steepens into an infinite gradient similarly to the canonical Majda–Rosales weakly dispersive system. The weak dispersion in general cannot prevent the wave breaking with instantaneous or delayed nonlinearities.
Original languageEnglish
JournalPhysica D: Nonlinear Phenomena
Publication date2002
Volume170
Journal number3-4
Pages287-303
ISSN0167-2789
DOIs
StatePublished
CitationsWeb of Science® Times Cited: 10
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