论文标题
混合拓扑光子晶体
Hybrid topological photonic crystals
论文作者
论文摘要
光子拓扑阶段提供了对电磁波的前所未有的操纵，引起了很多研究的兴趣，但是，这主要仅限于单个带隙。在这里，我们报告了杂化拓扑光子晶体的实验发现，这些晶体同时在不同的光子带隙中同时主持量子异常的大厅和山谷大厅的相位。随着手性边缘状态和山谷霍尔边缘状态在不同频率范围内的共存时，基本的混合拓扑阶段在边缘响应中表现出来。我们在实验中验证了这种新兴现象，并表明这种特征可以在边缘通道中的光子传输进行新颖的多路复用。我们的研究揭示了在单个光子系统中具有独特性质共存的拓扑结构的情况，该拓扑可能会依赖频率的滤波和对拓扑边缘光子的操纵。
Photonic topological phases offering unprecedented manipulation of electromagnetic waves have attracted much research interest which, however, have been mostly restricted to a single band gap. Here, we report on the experimental discovery of hybrid topological photonic crystals which host simultaneously quantum anomalous Hall and valley Hall phases in different photonic band gaps. The underlying hybrid topological phase manifests itself in the edge responses as the coexistence of the chiral edge states and valley Hall edge states in different frequency ranges. We experimentally verify such an emergent phenomenon and show that such a feature enables novel multiplexing of photon transport in the edge channels. Our study reveals a situation with coexisting topology of distinct nature in a single photonic system that may enable frequency-dependent filtering and manipulation of topological edge photons.
