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An ultrasonic metallic Fabry–Pérot metamaterial for use in water

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Askari_2020_An_ultrasonic_metallic_AM_101309_CC.pdf (1.784Mb)
Date
10/2020
Author
Askari, Meisam
Hutchins, David A.
Watson, Richard L.
Astolfi, Lorenzo
Nie, Luzhen
Freear, Steven
Thomas, Peter J.
Laureti, Stefano
Ricci, Marco
Clark, Matt
Clare, Adam T.
Keywords
Acoustic metamaterials
Additive manufacturing
Fabry–Pérot resonance
Selective laser melting
QC Physics
TK Electrical engineering. Electronics Nuclear engineering
Biomedical Engineering
Engineering (miscellaneous)
Industrial and Manufacturing Engineering
Materials Science(all)
DAS
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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.
Citation
Askari , M , Hutchins , D A , Watson , R L , Astolfi , L , Nie , L , Freear , S , Thomas , P J , Laureti , S , Ricci , M , Clark , M & Clare , A T 2020 , ' An ultrasonic metallic Fabry–Pérot metamaterial for use in water ' , Additive Manufacturing , vol. 35 , 101309 . https://doi.org/10.1016/j.addma.2020.101309
Publication
Additive Manufacturing
Status
Peer reviewed
DOI
https://doi.org/10.1016/j.addma.2020.101309
ISSN
2214-8604
Type
Journal article
Rights
Copyright © 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/).
Collections
  • University of St Andrews Research
URI
http://hdl.handle.net/10023/20634

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