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. 2020 Jan 24;11:487. doi: 10.1038/s41467-020-14364-3

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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. 1 — a Electron micrograph of a plasmonic bowtie with QDs in its vicinity. The image is a color-coded superposition of elemental maps taken by EDS in the STEM. The color key is shown at the bottom of the image. The scale bar represents 50 nm. b EEL spectra of a bare bowtie measured at the two locations indicated by matching colored dots in the inset, which is an annular dark-field (ADF) STEM image of the device. The scale bar represents 50 nm. c Simulated charge-density maps for the bright and dark dipolar modes at the indicated energies. d, e Experimental EEL maps for the bright (d) and dark (e) modes, constructed at the indicated energy ranges.