Surface defect gap solitons in two-dimensional optical lattices |
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Authors: | Meng Yun-Ji Liu You-Wen Tang Yu-Huang |
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Institution: | Department of Applied Physics, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China |
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Abstract: | We investigate the existence and stability of surface defect gap solitons at an interface between a defect of two-dimensional optical lattice and uniform saturable Kerr nonlinear medium. The surface defect embedded in the two-dimensional optical lattice gives rise to some unique properties. It is interestingly found that for the negative defect, stable surface defect gap solitons can exist both in the semi-infinite gap and in the first gap. The deeper the negative defect, the narrower the stable region in the semi-infinite gap will be. For a positive defect, the surface defect gap solitons exist only in the semi-infinite gap and the stable region localizes in a low power region. |
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Keywords: | surface defect gap soliton optical lattice saturable Kerr nonlinear media |
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