Counterpropagating spatial solitons in reflection gratings with a longitudinally modulated Kerr nonlinearity.
We investigate quasi-Bragg-matched counterpropagating spatial solitons in a reflection grating in the presence of a longitudinally modulated Kerr nonlinearity. The physical interplay of linear reflection and Kerr self-focusing with the modulation in the nonlinearity yields a variety of elaborate self-action mechanisms. We first analytically predict the existence of symmetric soliton pairs supported by a pure Kerr-like effective nonlinearity. We then analytically derive two families of solitons, associated with the linear grating eigenmodes, supported by an effective "incoherent" Kerr-like coupling arising from the exact balance between the modulation in the nonlinearity and the Kerr interaction due to beam interference.
Ciattoni
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Consiglio Nazionale delle Ricerche, CASTI Regional Lab, 67010 L'Aquila, Italy. allessandro.ciattoni@aquila.infn.it
Rizza
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DelRe
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Palange
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