Multipolar lasing modes from topological corner states

Ha-Reem Kim, Min-Soo Hwang, Daria Smirnova, Kwang-Yong Jeong, Yuri Kivshar () and Hong-Gyu Park ()
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Ha-Reem Kim: Korea University
Min-Soo Hwang: Korea University
Daria Smirnova: Australian National University
Kwang-Yong Jeong: Korea University
Yuri Kivshar: Australian National University
Hong-Gyu Park: Korea University

Nature Communications, 2020, vol. 11, issue 1, 1-8

Abstract: Abstract 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.

Date: 2020
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DOI: 10.1038/s41467-020-19609-9

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