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. 2019 Apr 24;8:40. doi: 10.1038/s41377-019-0149-7

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 5 — a Schematic of a photonic Su–Schrieffer–Heeger (SSH) structure with a kink in the middle. The structure can be viewed as two separate SSH structures with different winding numbers that are attached to each other side-by-side. b Scanning electron microscopy (SEM) image of a fabricated PhC-based SSH structure with a kink. c Micro-photoluminescence spectrum from a fabricated device with the excitation spot at the kink. d Near-field scanning optical microscope (NSOM) image recorded at the lasing wavelength shown in c