Stabilization of higher order multipole surface solitons in nonlocal thermal media

Abstract

We address the stabilization of higher order multipole surface solitons localized atthe interface of nonlocal thermal media by three different approaches. First, weinvestigate the existence and properties of the surface vector soliton complexes insuch material. Both the existence and stability regions of the vector solitons arerelatively narrow and show dependence on the sample width. We reveal that thevectorial coupling shows a remarkable stabilizing action on the multipoles withmore than two poles which are unstable in the scalar case. Second, we find thatthe introduction of a linear refraction index ramp exhibits a more significanteffect on stabilization of such multipoles. Third, we put forward the notion thatstabilization of the higher order multipoles could be achieved by trapping a certainpart of such solitons. Setting a nonlinear defect at suitable positions close to thethermal insulating interface constitutes a representative example of such a concept.