Tremendous efforts are devoted to the research of exotic photonic topological states, in which Floquet systems suggest new engineered topological phases and provide a powerful tool to manipulate the optical fields. Here, a gauge-induced topological state localized at the interface between two gauge-shifted Floquet photonic lattices with the same topological order is demonstrated. The quasienergy band structures reveal that these interface modes belong to the Floquet π modes, which are further found to enable an asymmetric topological transport of this interface mode thanks to the flexible control of the Floquet gauge. The intriguing propagations of the gauge-induced topological states are experimentally verified in a silicon waveguides platform at near-infrared wavelengths, which show broadband working wavelengths and robustness against the structural fluctuations. This work provides a new route in manipulating optical topological modes by Floquet engineering and inspires more possibilities in photonics integrations.

中文翻译：

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光子波导中的规范诱导 Floquet 拓扑状态

巨大的努力致力于奇异光子拓扑状态的研究，其中 Floquet 系统提出了新的工程拓扑相，并提供了一个强大的工具来操纵光场。在这里，演示了位于两个具有相同拓扑顺序的规范位移 Floquet 光子晶格之间的界面处的规范诱导拓扑状态。准能带结构表明这些界面模式属于 Floquet π 模式，由于 Floquet 规范的灵活控制，进一步发现这些界面模式能够实现该界面模式的不对称拓扑传输。在近红外波长的硅波导平台中，通过实验验证了规范诱导拓扑状态的有趣传播，显示宽带工作波长和对结构波动的鲁棒性。这项工作为通过 Floquet 工程操纵光学拓扑模式提供了一条新途径，并激发了光子学集成的更多可能性。