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. 2017 Aug 15;7:8151. doi: 10.1038/s41598-017-07232-6

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© The Author(s) 2017

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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Acoustic negative refraction with a beam. (a) Distribution of twenty acoustic metafibers along y direction as indicated by their discrete phase shift (twenty red hollow dots) resembling the desired phase profile φ(y) (blue line). (b) Photograph of the designed metafiber bundle. (c) Simulated and measured acoustic pressure field distributions with the acoustic metafiber bundle illuminated by the normally incident plane wave at 8.0 kHz. Black arrow in (c) refers to the theoretical value of the refraction.