We fmd families of solitary waves mediated by parametric mixing in quadratic nonlinear media that are localized at point-defect impurities. Solitons localized at attractive impurities are found to be dynamically stable. It is shown that localization at the impurity modifies strongly the soliton properties. (C) 1998 Elsevier Science B.V.
Physics Letters a, 1998, Vol 249, Issue 5-6, p. 455-458