标题： 一维弗洛凯光子拓扑绝缘体中的非衍射态 显示英文标题

标题： Non-diffracting states in one-dimensional Floquet photonic topological insulators

摘要： 一维激光写入的调制光子晶格已知特别适用于衍射管理。 在这里，我们通过实验观察和识别三种非衍射态，来探讨这种器件中离散非衍射态与拓扑性质之间的联系。 第一种对应于拓扑保护的边缘态，这是最近在弗洛凯拓扑绝缘体中预测的，而第二种和第三种都是体模式。 其中一种表明了拓扑转变，尽管其拓扑特征与边缘态不同，而另一种则来源于特定的能带结构设计。 显示英文摘要

摘要： One dimensional laser-written modulated photonic lattices are known to be particularly suitable for diffraction management purposes. Here, we address the connection between discrete non-diffracting states and topological properties in such devices through the experimental observation and identification of three classes of non-diffracting state. The first one corresponds to topologically protected edge states, recently predicted in Floquet topological insulators, while the second and third are both bulk modes. One of them testifies of a topological transition, although presenting topological features different from those of the edge states, whether the other one result from specific band structure engineering.