Multipolar lasing modes from topological corner states

Ha Reem Kim, Min Soo Hwang, Daria Smirnova, Kwang Yong Jeong, Yuri Kivshar*, Hong Gyu Park*

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    145 Citations (Scopus)

    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.

    Original languageEnglish
    Article number5758
    JournalNature Communications
    Volume11
    Issue number1
    DOIs
    Publication statusPublished - Dec 2020

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