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Floquet topological photonic crystals with temporally modulated media.
Optics Express ( IF 3.8 ) Pub Date : 2020-07-02 , DOI: 10.1364/oe.395504
Yao-Ting Wang , Ya-Wen Tsai , Wenlong Gao

We show that Floquet topological insulating states can exist in two-dimensional photonic crystals made of time-variant optical materials. By arranging the modulating phases, it facilitates effective gauge fields that give rise to topological effects. The band structures demonstrate the existence of topologically non-trivial bandgaps, thereby leading to back-scattering immune unidirectional edge states owing to bulk-edge correspondence. With these first-principle numerical results, we then verify the topological order for every Floquet band via Wilson loop approach. In the final paragraph, the possible experimental implementation for Floquet topological photonics is also discussed.

中文翻译:

具有时间调制介质的浮球拓扑光子晶体。

我们表明,Floquet拓扑绝缘态可以存在于由时变光学材料制成的二维光子晶体中。通过安排调制阶段,它有助于产生拓扑效应的有效规范场。带结构证明存在拓扑上不重要的带隙,由于体边缘对应,导致免疫反向单向边缘状态向后散射。借助这些第一性原理的数值结果,我们然后通过Wilson循环方法验证了每个Floquet带的拓扑顺序。在最后一段中,还讨论了Floquet拓扑光子学的可能实验实现。
更新日期:2020-07-06
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