An ultrasonic metallic Fabry–Pérot metamaterial for use in water

Meisam Askari; David A. Hutchins; Richard L. Watson; Lorenzo Astolfi; Luzhen Nie; Steven Freear; Peter J. Thomas; Stefano Laureti; Marco Ricci; Matt Clark; Adam T. Clare

doi:10.1016/j.addma.2020.101309

An ultrasonic metallic Fabry–Pérot metamaterial for use in water

Meisam Askari, David A. Hutchins^*, Richard L. Watson, Lorenzo Astolfi, Luzhen Nie, Steven Freear, Peter J. Thomas, Stefano Laureti, Marco Ricci, Matt Clark, Adam T. Clare

^*Corresponding author for this work

School of Physics and Astronomy

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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.

Original language	English
Article number	101309
Journal	Additive Manufacturing
Volume	35
Early online date	15 May 2020
DOIs	https://doi.org/10.1016/j.addma.2020.101309
Publication status	Published - Oct 2020

Keywords

Acoustic metamaterials
Additive manufacturing
Fabry–Pérot resonance
Selective laser melting

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10.1016/j.addma.2020.101309Licence: CC BY

Askari-2020-An-ultrasonic-metallic-AM-101309-CC
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/).
Final published version, 1.78 MBLicence: CC BY

Cite this

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title = "An ultrasonic metallic Fabry–P{\'e}rot metamaterial for use in water",

abstract = "Fabry-P{\'e}rot 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-P{\'e}rot 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.",

keywords = "Acoustic metamaterials, Additive manufacturing, Fabry–P{\'e}rot resonance, Selective laser melting",

author = "Meisam Askari and Hutchins, {David A.} and Watson, {Richard L.} and Lorenzo Astolfi and Luzhen Nie and Steven Freear and Thomas, {Peter J.} and Stefano Laureti and Marco Ricci and Matt Clark and Clare, {Adam T.}",

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AU - Askari, Meisam

AU - Hutchins, David A.

AU - Watson, Richard L.

AU - Astolfi, Lorenzo

AU - Nie, Luzhen

AU - Freear, Steven

AU - Thomas, Peter J.

AU - Laureti, Stefano

AU - Ricci, Marco

AU - Clark, Matt

AU - Clare, Adam T.

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AB - 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.

KW - Acoustic metamaterials

KW - Additive manufacturing

KW - Fabry–Pérot resonance

KW - Selective laser melting

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DO - 10.1016/j.addma.2020.101309

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JO - Additive Manufacturing

JF - Additive Manufacturing

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An ultrasonic metallic Fabry–Pérot metamaterial for use in water

Abstract

Keywords

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