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. 2017 Feb 17;7:42863. doi: 10.1038/srep42863

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Copyright © 2017, The Author(s)

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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The core arrays were first formed using the tube etching method. After filling the voids with epoxy resin (EPO-TEK 301), the metamaterial matching layer was then extracted via precise cutting and integrated with a piezoelectric material unit to test the broadband acoustic transmission performance. The structure was modelled as a pyramidal cone with a diameter d of 125 μm and taper length L = 610 μm.