Defect solitons in parity-time symmetric superlattices with focusing saturable nonlinearity
Defect solitons in parity-time symmetric superlattices with focusing saturable nonlinearity
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具有聚焦可饱和非线性的宇称时间对称超晶格中的缺陷孤子
DOI:
10.1016/j.optcom.2015.03.067
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发表时间:
2015-08
期刊:
影响因子:
--
通讯作者:
Tianshu Lai
中科院分区:
文献类型:
--
作者:
Lei Li;Huagang Li;Tianshu Lai
In this paper, we find that defect superlattice solitons (DSSs) exist at the defect site in one-dimensional optical superlattices with a parity-time (PT) symmetric potential and focusing saturable nonlinearity. We discuss the existence and stability of DSSs numerically and find that both the saturation parametersand the defect strengthεcan affect the power, the existence and stable regions of solitons significantly. For given saturation parametersand defect strengthε(propagation constantμ), the power of DSSs increases with the increase (decrease) ofμ(ε). For positive and zero defects, DSSs only exist in the semi-infinite band gap, whereas for negative defects, DSSs exist not only in the semi-infinite band gap but also in the first finite band gap. Besides, our numerical calculations show that when the saturation nonlinearity increases up to some level, the increasing rate of soliton power withμis very fast and the stable regions of DSSs will become obviously narrow and eventually disappear with a decrease ofεfor negative defects.
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影响因子:
8.6
作者:
Bender, CM;Boettcher, S
通讯作者:
Boettcher, S
影响因子:
8.6
作者:
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通讯作者:
Christodoulides, D. N.
DOI:
10.1103/physreve.73.026609
发表时间:
2006-02
期刊:
2006 Conference on Lasers and Electro-Optics and 2006 Quantum Electronics and Laser Science Conference
影响因子:
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通讯作者:
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影响因子:
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作者:
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通讯作者:
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影响因子:
3.8
作者:
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通讯作者:
Zhien Lu;Zhi-Ming Zhang