Askari, Meisam, Hutchins, David A., Watson, Richard L., Astolfi, Lorenzo, Nie, Luzhen, Freear, Steven, Thomas, Peter J., Laureti, Stefano, Ricci, Marco, Clark, Matt and Clare, Adam T. (2020) An ultrasonic metallic Fabry-Pérot metamaterial for use in water. Additive Manufacturing, 35 . 101309. doi:10.1016/j.addma.2020.101309 ISSN 2214-8604.

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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.

Item Type:	Journal Article
Subjects:	T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions:	Faculty of Science, Engineering and Medicine > Engineering > Engineering
Library of Congress Subject Headings (LCSH):	Metamaterials -- Acoustic properties, Laser beams, Electromagnetism, Electromagnetic fields
Journal or Publication Title:	Additive Manufacturing
Publisher:	Elsevier
ISSN:	2214-8604
Official Date:	October 2020
Dates:	Date Event October 2020 Published 15 May 2020 Available 30 April 2020 Accepted
Volume:	35
Article Number:	101309
DOI:	10.1016/j.addma.2020.101309
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Open Access (Creative Commons)
Date of first compliant deposit:	28 May 2020
Date of first compliant Open Access:	1 June 2020
RIOXX Funder/Project Grant:	Project/Grant ID RIOXX Funder Name Funder ID EP/N034163/1 [EPSRC] Engineering and Physical Sciences Research Council http://dx.doi.org/10.13039/501100000266 EP/N034201/1 [EPSRC] Engineering and Physical Sciences Research Council http://dx.doi.org/10.13039/501100000266 EP/N034813/1 [EPSRC] Engineering and Physical Sciences Research Council http://dx.doi.org/10.13039/501100000266

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