Interface solitons in quadratic nonlinear photonic lattices
Interface solitons in quadratic nonlinear photonic lattices
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DOI：
10.1103/physreva.80.013817
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发表时间：
2009-07
影响因子：
2.9
通讯作者：
Zhiyong Xu;M. Molina;Y. Kivshar
中科院分区：
文献类型：
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作者：
Zhiyong Xu;M. Molina;Y. Kivshar
我们研究了二次介质中分离两个不同周期光子晶格的界面上可能存在的双色非线性局域模的性质，重点讨论了光子晶格的位相失配对产生界面局域模的性质、稳定性和阈值功率的影响。我们使用了一个有效的离散模型和具有周期势的连续介质模型，并且发现这两个模型在定性上是一致的。界面模的动态激发表明，从二次光子晶格进入均匀介质时，双色界面扭曲模分裂成两束具有不同逃逸角度和不同能量的光束。通过合理地调节晶格参数，可以控制每个双色界面孤子的输出位置和能量含量。
We study the properties of two-color nonlinear localized modes which may exist at the interfaces separating two different periodic photonic lattices in quadratic media, focusing on the impact of phase mismatch of the photonic lattices on the properties, stability, and threshold power requirements for the generation of interface localized modes. We employ both an effective discrete model and continuum model with periodic potential and find good qualitative agreement between both models. Dynamic excitation of interface modes shows that a two-color interface twisted mode splits into two beams with different escaping angles and carrying different energies when entering a uniform medium from the quadratic photonic lattice. The output position and energy contents of each two-color interface solitons can be controlled by judicious tuning of the lattice parameters.