Askari, M, Hutchins, DA, Watson, RL et al. (8 more authors) (2020) An ultrasonic metallic Fabry–Pérot metamaterial for use in water. Additive Manufacturing, 35. 101309. ISSN 2214-7810
Abstract
Fabry-Pérot ultrasonic metamaterials have been additively manufactured using laser powder bed fusion to contain subwavelength holes with a high aspect-ratio of width to depth. Such metamaterials require the acoustic impedance mismatch between the structure and the immersion medium to be large. It is shown for the first time that metallic structures fulfil this criterion for applications in water over the 200–800 kHz frequency range. It is also demonstrated that laser powder bed fusion is a flexible fabrication method for the ceration of structures with different thicknesses, hole geometry and tapered openings, allowing the acoustic properties to be modified. It was confirmed via both finite element simulation and practical measurements that these structures supported Fabry-Pérot resonances, needed for metamaterial operation, at ultrasonic frequencies in water. It was also demonstrated the the additively-manufactured structures detected the presence of a sub-wavelength slit aperture in water.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2020 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/BY/4.0/). |
Keywords: | Acoustic metamaterials; Additive manufacturing; Selective laser melting; Fabry–Pérot resonance |
Dates: |
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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: | 18 Jun 2020 14:41 |
Last Modified: | 18 Jun 2020 14:41 |
Status: | Published |
Publisher: | Elsevier |
Identification Number: | 10.1016/j.addma.2020.101309 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:161742 |