Edge Solitons in Nonlinear-Photonic Topological Insulators
Edge Solitons in Nonlinear-Photonic Topological Insulators
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DOI：
10.1103/physrevlett.117.143901
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发表时间：
2016-09-28
影响因子：
8.6
通讯作者：
Chong, Y. D.
中科院分区：
文献类型：
--
作者：
Leykam, Daniel;Chong, Y. D.
我们从理论上证明了光子拓扑绝缘体可以支持边缘孤子，这些边缘孤子具有很强的自局域性，并沿沿着单向传播。光子拓扑绝缘体由耦合螺旋波导的Floquet晶格组成，在具有局部克尔非线性的介质中。线性晶格的拓扑相位对孤立子行为有很大影响。拓扑非平凡的相位给出了一个连续的孤子族，而拓扑平凡的相位给出了一个嵌入的孤子，发生在一个单一的权力和所产生的自诱导局部非线性位移的intersite耦合。孤子可用于非线性开关和逻辑运算，拓扑光子学尚未探索的功能。我们演示了利用孤子通过窄通道进行选择性滤波，以及利用孤子碰撞进行光开关。
We show theoretically that a photonic topological insulator can support edge solitons that are strongly self-localized and propagate unidirectionally along the lattice edge. The photonic topological insulator consists of a Floquet lattice of coupled helical waveguides, in a medium with local Kerr nonlinearity. The soliton behavior is strongly affected by the topological phase of the linear lattice. The topologically nontrivial phase gives a continuous family of solitons, while the topologically trivial phase gives an embedded soliton that occurs at a single power and arises from a self-induced local nonlinear shift in the intersite coupling. The solitons can be used for nonlinear switching and logical operations, functionalities that have not yet been explored in topological photonics. We demonstrate using solitons to perform selective filtering via propagation through a narrow channel, and using soliton collisions for optical switching.