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. 2020 May 25;9:90. doi: 10.1038/s41377-020-0319-7

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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. 11 — a Emission spectrum of the gain-medium dye (a fluorescein derivative) (red dashed line) and the spasing spectrum (solid black peak). An electron micrograph of the spasers is shown in the inset. b Optical image of radiating spaser aggregates under a confocal microscope. c The same as in b but obtained using STED super-resolution microscopy. d Confocal optical image of separated single spasers. e The same as in d but obtained using STED super-resolution microscopy. Adapted from ref. ³⁹.