Interface kink solitons in defocusing saturable nonlinear media |
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Authors: | Changming Huang |
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Institution: | Institute of Information Optics of Zhejiang Normal University, Jinhua 321004, China |
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Abstract: | 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. |
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Keywords: | Kink solitons Photonic lattices Defocusing saturable nonlinearity |
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