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. 2019 Nov 1;5(11):eaax0939. doi: 10.1126/sciadv.aax0939

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Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

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Fig. 5 — (A) Reflection spectra of the TiO₂ metasurface with l = 400 nm before (solid line) and after (dashed line) 1-min H⁺ ion implantation. The inset shows the top-view SEM image. Scale bar, 200 nm. (B) Enhancement factor (solid line) of light and the sizes (dots) of Ag nanoparticles as a function of wavelength.