Comptes Rendus
Enhanced acoustic transmission through a slanted grating
Comptes Rendus. Mécanique, Volume 343 (2015) no. 12, pp. 622-634.

It is known that an acoustic wave incident on an infinite array of aligned rectangular blocks of a different acoustic material exhibits total transmission if certain conditions are met [1] which relate the unique “intromission” angle of incidence with geometric and material properties of the slab. This extraordinary acoustic transmission phenomenon holds for any slab thickness, making it analogous to a Brewster effect in optics, and is independent of frequency as long as the slab microstructure is sub-wavelength in the length-wise direction. Here we show that the enhanced transmission effect is obtained in a slab with grating elements oriented obliquely to the slab normal. The dependence of the intromission angle θi is given explicitly in terms of the orientation angle. Total transmission is achieved at incidence angles ±θi, with a relative phase shift between the transmitted amplitudes of the +θi and θi cases. These effects are shown to follow from explicit formulas for the transmission coefficient. In the case of grating elements that are rigid the results have direct physical interpretation. The analytical findings are illustrated with full wave simulations.

Received:
Accepted:
Published online:
DOI: 10.1016/j.crme.2015.06.006
Keywords: Acoustic, Grating, Enhanced transmission, Oblique

Andrew N. Norris 1; Xiaoshi Su 1

1 Mechanical and Aerospace Engineering, Rutgers University, Piscataway, NJ 08854-8058, USA
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Andrew N. Norris; Xiaoshi Su. Enhanced acoustic transmission through a slanted grating. Comptes Rendus. Mécanique, Volume 343 (2015) no. 12, pp. 622-634. doi : 10.1016/j.crme.2015.06.006. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2015.06.006/

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