论文标题
通过耦合手性边缘模式与扁平带的拓扑慢光
Topological slow light via coupling chiral edge modes with flat bands
论文作者
论文摘要
光子拓扑绝缘子中的手性边缘模式具有巨大的潜力，可以通过拓扑保护实现缓慢的波导。在布里渊区周围增加手性边缘模式的绕组会导致宽带拓扑慢光光，并具有超低组速度。但是，这种效果通常需要在晶格边缘周围相对较大的面积上进行仔细的修改。在这里，我们提出了一个简单而通用的方案，可以通过将手性边缘模式与平坦的频带耦合，以实现宽带拓扑慢光。在这种方法中，不需要修改拓扑晶格。取而代之的是，只有几个支持平面频段的互音器需要在晶格边缘附加。我们使用陀螺磁光子晶体以数值为单位，该晶体准备在微波频率下进行测试。
Chiral edge modes in photonic topological insulators host great potential to realize slow-light waveguides with topological protection. Increasing the winding of the chiral edge mode around the Brillouin zone can lead to broadband topological slow light with ultra-low group velocity. However, this effect usually requires careful modifications on a relatively large area around the lattice edge. Here we present a simple and general scheme to achieve broadband topological slow light through coupling the chiral edge modes with flat bands. In this approach, modifications inside the topological lattice are not required. Instead, only several additional resonators that support the flat bands need to be attached at the lattice edge. We demonstrate our idea numerically using a gyromagnetic photonic crystal, which is ready to be tested at microwave frequencies.
