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. 2019 Jul 19;10:3242. doi: 10.1038/s41467-019-11143-7

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© The Author(s) 2019

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. 6 — Launching efficiency of HPhPs for different gold antenna lengths. a Launching cross-section, σ_M0, normalized to the area of the antenna, S_a as a function of both 1/L and frequency. The vertical dotted line mark the 1/L at which the red line shown in b has been extracted. b σ_M0/S_a for the antennas with the lengths L = 2.8 μm (red line), L = 5 μm and L = 0.5 μm. The vertical axes limits are the TO (bottom) and LO (top) phonon frequencies