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. 2020 Oct 7;11:5055. doi: 10.1038/s41467-020-18793-y

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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. 3 — a Absorption spectra of molecules in SP (blue curve) and MC (pink curve) state. b Schematic representation of the meta-atom consisting of a-Si:H with 40% of hydrogen core and a shell of SP photochromic molecules. The meta-atom is designed to support a strong higher-order Mie resonance at the absorption resonance of the MC state. The photoisomerization from SP to MC state and from MC to SP state is caused by UV and green light excitation, respectively. c, d Scattering cross-section (normalized to geometric) map of a core–shell nanostructure (c) after UV modification, and (d) green light recovery as a function of wavelength and a-Si:H nanoparticle radius. e Ratio between scattering cross sections of the core–shell after green light recovery and UV modification. f Scattering cross section of the core–shell with the Si core radius of 130 nm and its multipole decomposition. Solid lines correspond to the core–shell after UV modification, dashed lines correspond to the core–shell after green light recovery. The thickness of the PMMA + SP shell is 100 nm.