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(Color online) The scheme of the AOSA with arbitrary shape: (a) a three-dimensional view; (b) a cross section in r-θ plane.
(Color online) Acoustic pressure field distributions when a plane wave incident onto: [(a), (d)] the AOSA, [(b), (e)] a bare absorber with a sizeof 4 m, and [(c), (f)] a bare absorber with a size of 2 m. The contour is square in (a)-(c) while circular in (d)-(f). The plane wave travels from left to right.
(Color online) (a) ACS spectra of the AOSA and the bare absorbers with the radii of 4 and 2 m. Acoustic pressure field distributions of (b) a bare absorber with a radius of 2 m and (c) the AOSA under a plane wave incidence from left to right with a wavelength of 8 m.
(Color online) (a)-(c) Acoustic pressure field and (d)-(f) intensity distributions when a Gaussian beam impinges on the AOSA with the incident angles 0° [(a), (d)], 45° [(b), (e)], and 90° [(c), (f)]. The thick curves in [(a)-(c)] denote the sound rays.
(Color online) Acoustic pressure field distributions of an entrance (a) with and (b) without the AOSA under a plane wave incidence with a frequency of 1715 Hz. (c) Frequency dependence of the acoustic penetrated energy.
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