Ph.D Student | Bartal Guy |
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Subject | Nonlinear Waves in Periodic Photonic Structures |

Department | Department of Physics |

Supervisor | ? 18? Mordechai Segev |

Full Thesis text |

· First experimental observation of the extended Brillouin-zone map of photonic lattices and photonic lattices with defects. This observation has led to the invention of a novel technique for mapping out photonic lattices, photonic crystals fibers, or periodic structures in fields beyond optics

· First experimental observation of Random-phase lattice solitons in any system in nature.

These are lattice solitons made of incoherent light. We have demonstrated self-trapping of spatially-incoherent beams in nonlinear waveguide array, and showed that the spatial spectrum of such entities is multi-humped. We found out that under self-focusing nonlinearity the modal constituents of such RPLS reside in the normally diffracting regions of the lattice band structure spectrum in momentum space.

· First experimental observation of Gap Random-phase lattice solitons; self-localized spatially-incoherent states whose modal constituents lie within a photonic band gap, having no contribution from modes arising from the semi-infinite gap.

· First experimental observation of solitons carrying topological charge ('vortex-ring lattice solitons'), in any system in nature

· First experimental observation of vortex solitons arising from the second band of a 2D lattice; this constitutes the first observation of higher-band solitons in 2D periodic structures.

· First experimental study of spatial four-wave-mixing in photonic lattices; we have demonstrated universal aspects of nonlinear processes in periodic media, such as engineered phase-matching, Bloch-wave folding, and continuous control over the band at which the interaction products emerge. This work combines one of the main nonlinear optics themes (four-wave-mixing) and the fundamentals of waves propagation in periodic structures (the Floquet-Bloch theory) to demonstrate these new universal ideas.