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Phys Rev Lett. 2009 Sep 11;103(11):113903. Epub 2009 Sep 11.

Observation of three-dimensional discrete-continuous x waves in photonic lattices.

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  • 1Institute of Applied Physics, Friedrich-Schiller-Universit√§t Jena, Max-Wien-Platz 1, 07743 Jena, Germany.

Erratum in

  • Phys Rev Lett. 2011 Jan 14;106(2):029901.


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.

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