Year: 2015
Type: conference-abstract
Abstract: 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 which relate the unique “intromission” angle of incidence with the geometric and material properties of the slab. This extraordinary acoustic transmission phenomenon holds for any thickness of the slab, making it analogous to a Brewster effect in optics, and is independent of frequency as long as the slab microstructure is sub-wavelength. Here, we show that the enhanced transmission effect can be obtained in a slab with parallel 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 also achieved at incidence angle -θi although there is a relative phase shift between the transmitted amplitudes of the +θi and −θi cases. These effects are easily understood when the grating elements are rigid. In particular, any angle of intromission can be obtained by with thin rigid elements by orienting them to the desired value of θi.
DOI: 10.1121/1.4920265
Author: Andrew Norris
Institution: Rutgers, The State University of New Jersey
Language: English
Subfield: Biomedical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W3105133244
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