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. 2019 Jul 26;10:3336. doi: 10.1038/s41467-019-11315-5

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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. 2 — Strong coupling of plasmons in Al nanoparticles and excitations in benzene molecules. The calculated photoabsorption spectra of nanoparticle-molecule systems composed of (a) Al₂₀₁, (b) Al₅₈₆, and (c) Al₁₂₈₉ nanoparticles coupled with N benzene molecules at 3 Å separation (solid lines) show clearly separated lower and upper polaritons, the splitting of which increases with N. Spectra of the bare Al particles and benzene molecule are shown for reference (dotted lines)