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. 2021 Mar 25;11:6873. doi: 10.1038/s41598-021-85965-1

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© The Author(s) 2021

Open AccessThis 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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Calculated enhancement factors after 1 ms (dashed lines) and 10 ms (solid lines) of an incident plane wave (wavelength 785 nm) with intensity 20, 50 and 100 mW μm $^{- 2}$ , respectively. The integrated surface enhancement factor in air (cf. Fig. 3b) (solid red line) is shown for comparison.