Simultons are self-trapped spatial beams, which are sustained by second-harmonic generation. They are optical spatial solitons composed by beams with two frequencies, one fundamental and its second harmonic. So far they have been observed only in media without disorder.
C.Conti, E. D'Asaro, S. Stivala, A. Busacca and G. Assanto, reported on the theory of simultons in quadratic media with random nonlinearity, and on their experimental observation.
This is the first observation of optical solitons in media with a disordered nonlinear susceptibility.
The figure shows the numerical simulation of the two components (a/b and c/d) of a simulton
for two different strengths of disorder.
Details in Opt. Lett. 35, 3760 (2010) .
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