Trapped air metamaterial concept for ultrasonic sub-wavelength imaging in water

Abstract

Acoustic metamaterials constructed from conventional base materials can exhibit exotic phenomena not commonly found in nature, achieved by combining geometrical and resonance effects. However, the use of polymer-based metamaterials that could operate in water is difficult, due to the low acoustic impedance mismatch between water and polymers. Here we introduce the concept of “trapped air” metamaterial, fabricated via vat photopolymerization, which makes ultrasonic sub-wavelength imaging in water using polymeric metamaterials highly effective. This concept is demonstrated for a holey-structured acoustic metamaterial in water at 200–300 kHz, via both finite element modelling and experimental measurements, but it can be extended to other types of metamaterials. The new approach, which outperforms the usual designs of these structures, indicates a way forward for exploiting additive-manufacturing for realising polymer-based acoustic metamaterials in water at ultrasonic frequencies.

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Item Type:	Article
Authors/Creators:	Laureti, S Hutchins, DA Astolfi, L Watson, RL Thomas, PJ Burrascano, P Nie, L https://orcid.org/0000-0002-5796-907X Freear, S https://orcid.org/0000-0001-7858-4155 Askari, M Clare, AT Ricci, M
Copyright, Publisher and Additional Information:	© The Author(s) 2020. 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/.
Keywords:	Acoustics; Materials science; Metamaterials
Dates:	Accepted: 1 June 2020 Published (online): 30 June 2020 Published: December 2020
Institution:	The University of Leeds
Academic Units:	The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Electronic & Electrical Engineering (Leeds) > Robotics, Autonomous Systems & Sensing (Leeds)
Funding Information:	Funder Grant number EPSRC (Engineering and Physical Sciences Research Council) EP/N034813/1
Depositing User:	Symplectic Publications
Date Deposited:	08 Jul 2020 10:18
Last Modified:	08 Jul 2020 10:18
Status:	Published
Publisher:	Nature Research
Identification Number:	10.1038/s41598-020-67454-z
Open Archives Initiative ID (OAI ID):	oai:eprints.whiterose.ac.uk:162848

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Trapped air metamaterial concept for ultrasonic sub-wavelength imaging in water

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