Nonlinear X-wave

In physics, a nonlinear X-wave (NLX) is a multi-dimensional wave that can travel without distortion.

Nonlinear X-wave schematic view

At variance with X-waves, a nonlinear X-wave does exist in the presence of nonlinearity, and in many cases it self-generates from a Gaussian (in any direction) wave packet.

The distinctive feature of an NLX is its "biconical" shape, (see figure) which appears as an "X" in any section plane containing the wave peak and the direction of propagation.

So far, nonlinear X-waves have been only observed in nonlinear optics experiments, and have been predicted to occur in a variety of nonlinear media including Bose–Einstein condensates.[1]

History
  • Preliminary experimental results were reported CLEO/QELS conference in 2001[2]
  • The first article was published in Physical Review Letters in 2003 and reported on the theoretical prediction of the existence of nonlinear X-waves.[3]
  • The first experimental results also appeared in Physical Review Letters in 2003.[4]

References
  1. Colas, D.; Laussy, F.; Davis, M. (10 June 2019). "Formation of nonlinear X-waves in condensed matter systems". Physical Review B. 99 (21): 214301. arXiv:1903.12357. Bibcode:2019PhRvB..99u4301C. doi:10.1103/PhysRevB.99.214301. S2CID 88524670.
  2. Valiulis, G.; Kilius, J.; Jedrkiewicz, O.; Bramati, A.; Minardi, S.; Conti, C.; Trillo, S.; Piskarskas, A.; Trapani, Di (2001). "Space-time nonlinear compression and three-dimensional complex trapping in normal dispersion". Quantum Electronics and Laser Science Conference (QELS 2001), Technical Digest. OSA Trends in Optics and Photonics. 57 (Postconference ed.). Washington DC: Optical Society of America. arXiv:physics/0311081.
  3. Conti, C.; Trillo, S.; Di Trapani, P.; Valiulis, G.; Piskarskas, A.; Jedrkiewicz, O.; Trull, J. (2 May 2003). "Nonlinear Electromagnetic X Waves". Physical Review Letters. 90 (17): 170406. Bibcode:2003PhRvL..90q0406C. doi:10.1103/physrevlett.90.170406. ISSN 0031-9007. PMID 12786060.
  4. Di Trapani, P.; Valiulis, G.; Piskarskas, A.; Jedrkiewicz, O.; Trull, J.; Conti, C.; Trillo, S. (28 August 2003). "Spontaneously Generated X-Shaped Light Bullets". Physical Review Letters. 91 (9): 093904. arXiv:physics/0303083. Bibcode:2003PhRvL..91i3904D. doi:10.1103/physrevlett.91.093904. ISSN 0031-9007. PMID 14525185. S2CID 11160156.
  • VINO The Virtual Institute for Nonlinear Optics is a research collaboration devoted to the investigation of X-waves and conical waves in general.
  • Nolinear X-waves page at the nlo.phys.uniroma1.it website.


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