Observation of optical solitons in PT-symmetric lattices.
Observation of optical solitons in PT-symmetric lattices.
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DOI：
10.1038/ncomms8782
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发表时间：
2015-07-28
影响因子：
16.6
通讯作者：
Peschel U
中科院分区：
文献类型：
--
作者：
Wimmer M;Regensburger A;Miri MA;Bersch C;Christodoulides DN;Peschel U
控制非线性有源环境中的光传输是光学领域非常感兴趣的课题。在这种复杂的安排中，特别重要的是制定战略，即使在存在收益/损失和非线性的情况下也要控制混乱的行为，这些行为往往扮演着敌对的角色。最近，奇偶时间(PT)对称性的概念在光子环境中被提出，作为一种在同时使用放大和衰减的平台中加强稳定能量流动的手段。本文报道了PT对称晶格中光孤子的实验观测。与其他非保守的非线性安排不同，在控制方程的参数空间中，自陷态表现为固定点，离散PT孤子形成连续的参数解族。还证明了合成PT对称可饱和吸收体的可能性，其中非线性波通过另外一个吸收系统找到无损路径。宇称-时间对称性可以在同时放大和衰减的光子系统中施加稳定的能量流。在这里，Wimmer等人。证明了在奇偶时间对称格子中属于连续参数解族的光孤子，并观察到饱和的吸收作用。
Controlling light transport in nonlinear active environments is a topic of considerable interest in the field of optics. In such complex arrangements, of particular importance is to devise strategies to subdue chaotic behaviour even in the presence of gain/loss and nonlinearity, which often assume adversarial roles. Quite recently, notions of parity-time (PT) symmetry have been suggested in photonic settings as a means to enforce stable energy flow in platforms that simultaneously employ both amplification and attenuation. Here we report the experimental observation of optical solitons in PT-symmetric lattices. Unlike other non-conservative nonlinear arrangements where self-trapped states appear as fixed points in the parameter space of the governing equations, discrete PT solitons form a continuous parametric family of solutions. The possibility of synthesizing PT-symmetric saturable absorbers, where a nonlinear wave finds a lossless path through an otherwise absorptive system is also demonstrated. Parity–time symmetry can impose a stable energy flow in photonic systems with simultaneous amplification and attenuation. Here, Wimmer et al. demonstrate optical solitons belonging to a continuous parametric family of solutions in a parity–time-symmetric lattice and observe saturable absorber action.