Defect dark solitons in PT-symmetric optical lattices

Abstract

Abstract:

Defect dark solitons were numerically researched in parity-time-symmetric optical lattices with an additional defect in the real part. When the diffraction is balanced with the self-defocusing nonlinear effect, dark solitons can be obtained; when a defect is added in the real part of parity-time-symmetric optical lattices, defect dark solitons can also be obtained. Numerical results showed that defect dark solitons can exist and be stable in large parameters range; the strength of additional defect has a maximum value, and the defect dark solitons do not exist above this value; the amplitude of the imaginary part of parity-time-symmetric optical lattices can affect the stability of the defect dark solitons.

Key words: Nonlinear optics, Defect dark solitons, Parity-time-symmetric optical lattice, Stability

Yi Xiangdong，Xie Qingwen，Luo Zhihua ， Shi Zhiwei， Zhu Xing ，Li Huagang. Defect dark solitons in PT-symmetric optical lattices[J]. J4, 2015, 32(6): 728-734.

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