Photorefractive solitons embedded in gratings in centrosymmetric crystals.
We investigate (1+1D) spatial optical solitons embedded in a fixed-volume grating in centrosymmetric photorefractive crystals. We numerically identify a two-parameter soliton family and deduce both its existence surface and soliton profiles. For shallow gratings, the soliton Fourier spectrum exhibits three lobes located at the reciprocal lattice points -K, 0, and K. Soliton trapping is a consequence of both the self-induced nonlinear waveguide and the grating reflectivity, which prevents the breakaway of the lateral components. To provide a preliminary evaluation of soliton stability, we also investigate the propagation of slightly perturbed soliton profiles.
Ciattoni
Alessandro
A
Consiglio Nazionale delle Richerche, CASTI Regional Laboratory, Dipartimento di Fisica, Italy. alessandro.ciattoni@aquila.infn.it
Rizza
Carlo
C
DelRe
Eugenio
E
Palange
Elia
E