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. 2021 Sep 21;12:5560. doi: 10.1038/s41467-021-25797-9

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© The Author(s) 2021

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. 5 — a The microscope image of nanocrystals (NCs) on a microplate covered with polystyrene spheres under the white light illumination. The sample is marked with the dashed lines. b The upconversion fluorescent image recorded by the achromatic metalens with NA = 0.24. c The upconversion fluorescent image recorded by a commercial achromatic objective lens with N = 0.26 (MY10X-823, Mitutoyo). d The microscope image of HeLa cells with upconversion NCs. e and f and the upconversion fluorescent images recorded by the metalens and a commercial objective lens.