Bragg gap solitons in PT symmetric lattices with competing nonlinearity

OPTICS COMMUNICATIONS

卷:285

Article

Liu, Shuang^2,3  Ma, Caiwen²  Zhang, Yiqi¹  Lu, Keqing⁴ 

[1] Xi An Jiao Tong Univ, Dept Elect Sci & Technol, Xian 710049, Peoples R China

[2] Chinese Acad Sci, Xian Inst Opt & Precis Mech, Xian 710119, Peoples R China

[3] Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China

[4] Tianjin Polytech Univ, Sch Informat & Commun Engn, Tianjin 300160, Peoples R China

关键词: Gap solitons;    PT symmetry;    Competing Nonlinearity;   

DOI  :  10.1016/j.optcom.2011.11.065

来源: Elsevier

【 摘 要 】

The effect of competing nonlinearity on beam dynamics in parity-time (PT) symmetric potentials is investigated. By using numerical methods, the existence of gap solitons is demonstrated in the first Bragg band gap of optical (PT) symmetric lattices with competing nonlinearity. Meanwhile, the stability of such solitons is analyzed through introducing a small perturbation to the solitary solutions. The abrupt annihilation of the solitons during propagation demonstrates that the Bragg gap solitons in PT symmetric potentials are not stable. In comparison with the on-site gap solitons, the off-site gap solitons exhibit more robust properties during propagation. (C) 2011 Elsevier B.V. All rights reserved.

【 授权许可】

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