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. 2020 Aug 21;9:148. doi: 10.1038/s41377-020-00387-4

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© The Author(s) 2020

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. 2 — a Unit cell of the photonic crystal slab without in-plane inversion symmetry. Triangular air holes are etched in the Si₃N₄ layer. b, c Simulated and measured angle-resolved transmittance spectra in the visible range under σ₊-polarized incidence. The incidence plane is along the Γ-X direction. Diminished regions indicated by blue arrows imply the existence of circularly polarized states after breaking the in-plane inversion symmetry. d Unit cell of photonic crystal slabs with in-plane inversion symmetry. Circular air holes are etched in the Si₃N₄ layer. e, f Simulated and measured angle-resolved transmittance spectra in the visible range under σ₊-polarized incidence. The spectra are symmetric for the PhC slab with in-plane inversion symmetry