Interface kink solitons in defocusing saturable nonlinear media

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• 作者：Changming Huang^a ; Jiangbo Zheng^a ; Shunsheng Zhong^a ; Liangwei Dong ; ^a ; ^{donglw@zjnu.cn"" rel=""nofollow} ;
• 关键词：Kink solitons ; Photonic lattices ; Defocusing saturable nonlinearity
• 刊名：Optics Communications
• 出版年：2011
• 出版时间：15 August 2011
• 年：2011
• 卷：284
• 期：18
• 页码：4225-4228
• 全文大小：267 K

文摘

We report on the dynamics of semi-localized nonlinear optical modes supported by an interface separating a uniform defocusing saturable medium and an imprinted semi-infinite photonic lattice. Out-of-phase and in-phase kink solitons composed by dark-soliton-like pedestals and oscillatory tails are found. Two branches of out-of-phase kink solitons exist in shallow lattices. Saturable nonlinearity enhances the pedestal height and renormalized energy flow of kink solitons evidently. While in-phase kink solitons are always unstable, out-of-phase kink solitons will be completely stable provided that lattice depth exceeds a critical value. Furthermore, stable kink solitons in the higher band gaps are also possible. Our results may give a helpful hint for understanding the dynamics of kink solitons with high pedestals in other fields.