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Observation of three-dimensional discrete-continuous X waves in photonic lattices

: Heinrich, M.; Szameit, A.; Dreisow, F.; Keil, R.; Minardi, S.; Pertsch, T.; Nolte, S.; Tünnermann, A.; Lederer, F.


Physical review letters 103 (2009), Nr.11, Art. 113903, 4 S.
ISSN: 0031-9007
ISSN: 1079-7114
Fraunhofer IOF ()
diffraction-free; fused silica; guide array; solution

We report on the generation of three-dimensional discrete X waves in a femtosecond laser-written waveguide array. Our measurements constitute the first experimental observation of temporally localized three-dimensional discrete-continuous entities. The X waves spontaneously emerge from a single-site excitation due to the discrete diffraction of the lattice and the normally dispersive as well as cubically nonlinear properties of the fused silica used as host material.