Journal
APPLIED PHYSICS LETTERS
Volume 115, Issue 8, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.5114877
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Funding
- COST (European Cooperation in Science and Technology) [CA15125]
- London South Bank University
- Royal Opera House, Covent Garden
- United Kingdom Acoustics Network (UKAN)
- ANR-RGC METARoom project [ANR-18CE08-0021]
- project HYPERMETA under the program Etoiles Montantes of the Region Pays de la Loire
- Generalitat Valenciana [APOSTD/2017/042]
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An acoustic metadiffuser is a subwavelength locally resonant surface relying on slow sound propagation. Its design consists of rigidly backed slotted panels, with each slit being loaded by an array of Helmholtz resonators. Due to the slow sound properties, the effective thickness of the panel can therefore be dramatically reduced when compared to traditional diffusers made of quarter-wavelength resonators. The aim of this work is to experimentally validate the concept of metadiffusers from the scattering measurements of a specific metadiffuser design, i.e., a quadratic residue metadiffuser. The experimental results reported herein are in close agreement with analytical and numerical predictions, therefore showing the potential of metadiffusers for controlling sound diffusion at very low frequencies.
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