Observation of three-dimensional discrete-continuous x waves in photonic lattices.
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.
Heinrich
M
M
Institute of Applied Physics, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, 07743 Jena, Germany. heinrich@iap.uni-jena.de
Szameit
A
A
Dreisow
F
F
Keil
R
R
Minardi
S
S
Pertsch
T
T
Nolte
S
S
Tünnermann
A
A
Lederer
F
F