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. 2018 Oct 19;8:15536. doi: 10.1038/s41598-018-33617-2

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© The Author(s) 2018

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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(a) FDTD simulation results of transmission spectra through the bare slot antenna with (red) and without (black) PMMA, for L = 200 µm and w_gap = 15 µm. (b) Transmission spectra through the hybrid slot antenna with (red) and without (black) PMMA for l_NW = 5 µm. (c) Resonant-frequency shift as a function of the total number of AgNWs (N_NW). (d) Enhancement factor as a function of w_gap for fixed N_NW = 80 and l_NW/w_gap = 1/3. (The solid line is a guide to the eye.).