Propagation of solitons in thermal media with periodic nonlinearity

摘要

We address the existence and properties of solitons in layered thermal mediamade of alternating focusing and defocusing layers. Such structures supportrobust bright solitons even if the averaged nonlinearity is defocusing. We showthat non-oscillating solitons may form in any of the focusing domains, even inthose located close to the sample edge, in contrast to uniform thermal mediawhere light beams always oscillate when not launched exactly on the samplecenter. Stable multipole solitons may include more than four spots in layeredmedia.