Metadiffusers: Deep-subwavelength sound diffusers

Abstract We present deep-subwavelength diffusing surfaces based on acoustic metamaterials, namely metadiffusers. These sound diffusers are rigidly backed slotted panels, with each slit being loaded by an array of Helmholtz resonators. Strong dispersion is produced in the slits and slow sound conditi...

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Autores principales:	Noé Jiménez, Trevor J. Cox, Vicent Romero-García, Jean-Philippe Groby
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/1663c2b52e7b419899148530119e23f1
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spelling	oai:doaj.org-article:1663c2b52e7b419899148530119e23f12021-12-02T11:52:25ZMetadiffusers: Deep-subwavelength sound diffusers10.1038/s41598-017-05710-52045-2322https://doaj.org/article/1663c2b52e7b419899148530119e23f12017-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-05710-5https://doaj.org/toc/2045-2322Abstract We present deep-subwavelength diffusing surfaces based on acoustic metamaterials, namely metadiffusers. These sound diffusers are rigidly backed slotted panels, with each slit being loaded by an array of Helmholtz resonators. Strong dispersion is produced in the slits and slow sound conditions are induced. Thus, the effective thickness of the panel is lengthened introducing its quarter wavelength resonance in the deep-subwavelength regime. By tuning the geometry of the metamaterial, the reflection coefficient of the panel can be tailored to obtain either a custom reflection phase, moderate or even perfect absorption. Using these concepts, we present ultra-thin diffusers where the geometry of the metadiffuser has been tuned to obtain surfaces with spatially dependent reflection coefficients having uniform magnitude Fourier transforms. Various designs are presented where, quadratic residue, primitive root and ternary sequence diffusers are mimicked by metadiffusers whose thickness are 1/46 to 1/20 times the design wavelength, i.e., between about a twentieth and a tenth of the thickness of traditional designs. Finally, a broadband metadiffuser panel of 3 cm thick was designed using optimization methods for frequencies ranging from 250 Hz to 2 kHz.Noé JiménezTrevor J. CoxVicent Romero-GarcíaJean-Philippe GrobyNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-12 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Noé Jiménez Trevor J. Cox Vicent Romero-García Jean-Philippe Groby Metadiffusers: Deep-subwavelength sound diffusers
description	Abstract We present deep-subwavelength diffusing surfaces based on acoustic metamaterials, namely metadiffusers. These sound diffusers are rigidly backed slotted panels, with each slit being loaded by an array of Helmholtz resonators. Strong dispersion is produced in the slits and slow sound conditions are induced. Thus, the effective thickness of the panel is lengthened introducing its quarter wavelength resonance in the deep-subwavelength regime. By tuning the geometry of the metamaterial, the reflection coefficient of the panel can be tailored to obtain either a custom reflection phase, moderate or even perfect absorption. Using these concepts, we present ultra-thin diffusers where the geometry of the metadiffuser has been tuned to obtain surfaces with spatially dependent reflection coefficients having uniform magnitude Fourier transforms. Various designs are presented where, quadratic residue, primitive root and ternary sequence diffusers are mimicked by metadiffusers whose thickness are 1/46 to 1/20 times the design wavelength, i.e., between about a twentieth and a tenth of the thickness of traditional designs. Finally, a broadband metadiffuser panel of 3 cm thick was designed using optimization methods for frequencies ranging from 250 Hz to 2 kHz.
format	article
author	Noé Jiménez Trevor J. Cox Vicent Romero-García Jean-Philippe Groby
author_facet	Noé Jiménez Trevor J. Cox Vicent Romero-García Jean-Philippe Groby
author_sort	Noé Jiménez
title	Metadiffusers: Deep-subwavelength sound diffusers
title_short	Metadiffusers: Deep-subwavelength sound diffusers
title_full	Metadiffusers: Deep-subwavelength sound diffusers
title_fullStr	Metadiffusers: Deep-subwavelength sound diffusers
title_full_unstemmed	Metadiffusers: Deep-subwavelength sound diffusers
title_sort	metadiffusers: deep-subwavelength sound diffusers
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/1663c2b52e7b419899148530119e23f1
work_keys_str_mv	AT noejimenez metadiffusersdeepsubwavelengthsounddiffusers AT trevorjcox metadiffusersdeepsubwavelengthsounddiffusers AT vicentromerogarcia metadiffusersdeepsubwavelengthsounddiffusers AT jeanphilippegroby metadiffusersdeepsubwavelengthsounddiffusers
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Metadiffusers: Deep-subwavelength sound diffusers

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