Multipolar lasing modes from topological corner states.
Multipolar lasing modes from topological corner states.
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DOI：
10.1038/s41467-020-19609-9
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发表时间：
2020-11-13
影响因子：
16.6
通讯作者：
Park HG
中科院分区：
文献类型：
--
作者：
Kim HR;Hwang MS;Smirnova D;Jeong KY;Kivshar Y;Park HG
拓扑光子学提供了一个基本的框架，强大的操纵光，包括定向运输和本地化与内置的免疫紊乱。与光学增益相结合，有源拓扑腔在发光器件的设计中具有特殊的前景。迄今为止，大多数研究都集中在有限系统或畴壁的拓扑边缘的激光。最近发现的高阶拓扑相位使光在角落处的强高质量限制成为可能。在这里，我们展示了纳米光子拓扑结构中角态的激光作用。我们通过高光谱成像识别了几种具有不同发射轮廓的多极角模，并识别了泄漏拓扑状态的非厄米特辐射耦合的签名。此外，根据在一个大尺寸的腔中的泵浦位置，我们产生选择性的激光从拓扑带隙内的边缘或角状态。我们的研究提供了直接观察多极激光和工程集体共振在有源拓扑纳米结构。高阶光子拓扑状态，如角态，可以使光的鲁棒和高质量的限制到一个小的模式体积。在这里，作者演示了激光从拓扑多极角状态，并通过高光谱成像研究其发射轮廓。
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 nanophotonic topological structures. We identify several 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 generate selectively lasing from either edge or corner states within the topological bandgap. Our studies provide the direct observation of multipolar lasing and engineered collective resonances in active topological nanostructures. Higher-order photonic topological states, such as corner states, could enable robust and high-quality confinement of light to a small mode volume. Here, the authors demonstrate lasing from topological multipole corner states and investigate their emission profiles via hyperspectral imaging.
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