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Cited by 82Acoustic Wave Phenomena ResearchMetamaterials and Metasurfaces ApplicationsCellular and Composite Structures

Metadiffusers: Deep-Subwavelength Sound Diffusers

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Jiménez, Noé, Cox, Trevor J., Romero-García, Vicent, Groby, Jean-Philippe·2017·Scientific Reports
DOI 10.1038/s41598-017-05710-5PMC PMC5511165
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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.

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  • Most current papers on acoustic panel development only cover analytical problem formulation or final design measurement in engineering reports.

    “Most of the current papers on acoustic panel development only cover the analytical problem formulation [7,8] or the final design measurement in the engineering reports [9,10,11].”

    From Sustainable Perforated Acoustic Wooden Panels Designed Using Third-Degree-of-Freedom Bezier Curves with Broadband Sound Absorption Coefficients (2023) · cites this paper as [7]

    The Introduction discusses earlier diffuser designs, while Results > Quadratic residue metadiffusers describes this paper’s theoretical predictions and numerical validation (page numbers unavailable). Neither passage assesses whether most acoustic-panel papers cover only analytical formulations or final design measurements. Searches for that characterization and for experimental design measurements found no supporting passage in our copy. (LLM, conf=0.73)

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Research works printed but not linked: 38

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Authors
Jiménez, N., Cox, T. J., Romero-García, V., & Groby, J.-P.
Affiliations
  • University of Salford (GB)
  • Centre National de la Recherche Scientifique (FR)
ORCID
Venue
Scientific Reports
Publisher
Springer Science and Business Media LLC
Published
2017-07-14
Volume
7
Issue
1
Pages
5389-5389
ISSN
2045-2322 (ISSN-L)
DOI
10.1038/s41598-017-05710-5
PMC
PMC5511165
OpenAlex
W2736196293
Cited by
82
References
0
Citations by year
2026: 4 · 2025: 10 · 2024: 13 · 2023: 5 · 2022: 7 · 2021: 13 · 2020: 9 · 2019: 12 · 2018: 8 · 2017: 1
FWCI
3.69
Type
journal article
Language
en
Open access
Licence
Locations
  • Scientific Reports (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • University of Salford Institutional Repository (University of Salford) (submittedVersion, cc-by)
  • HAL (submittedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • RiuNet (Universitat Politècnica de València) (submittedVersion, cc-by-nc-nd)
Funders
Agence Nationale de la Recherche (13-BS09-, ANR-13-BS09-0003)
Topics
  • Physical Sciences › Engineering › Biomedical Engineering › Acoustic Wave Phenomena Research
  • Physical Sciences › Materials Science › Electronic, Optical and Magnetic Materials › Metamaterials and Metasurfaces Applications
  • Physical Sciences › Engineering › Mechanical Engineering › Cellular and Composite Structures
Keywords
acoustic metamaterials, acoustic diffusers, Helmholtz resonator, slow sound, reflection coefficient, ternary sequences, shape optimization

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