论文标题
来自多极拓扑角状态的激光
Lasing from multipole topological corner states
论文作者
论文摘要
拓扑光子学为对光的强大操纵提供了一个基本框架，包括方向运输和本地化，内置免疫对疾病。加上光学增益，主动拓扑腔对发光设备的设计具有特殊的诺言。迄今为止，大多数研究都集中在有限系统或域壁的拓扑边缘上。最近发现的高阶拓扑阶段可在拐角处强大的高质量光线限制。在这里，我们在纳米光拓扑腔中展示了角状态的激光作用。我们通过高光谱成像和辨别泄漏拓扑状态的非热辐射耦合的特征来识别具有不同发射曲线的四个多极角模式。此外，根据大型腔体中的泵位置，我们有选择地从拓扑带盖中的边缘或角状态产生激光。我们的发现将途径引入了工程师的集体共振和量身定制的主动拓扑回路中的光。
Topological photonics provides a fundamental framework for robust manipulation of light, including directional transport and localization with built-in immunity to disorder. Combined with an optical gain, active topological cavities hold special promise for a design of light-emitting devices. Most studies to date have focused on lasing at topological edges of finite systems or domain walls. Recently discovered higher-order topological phases enable strong high-quality confinement of light at the corners. Here we demonstrate lasing action of corner states in a nanophotonic topological cavity. We identify four multipole corner modes with distinct emission profiles via hyperspectral imaging and discern signatures of non-Hermitian radiative coupling of leaky topological states. In addition, depending on the pump position in a large-size cavity, we selectively generate lasing from either edge or corner states within the topological bandgap. Our findings introduce pathways to engineer collective resonances and tailor generation of light in active topological circuits.
