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(Color online) (a) An artistic and (b) a schematic view of the scattering acoustical element (SAE) setup. The incident wave (S) is shown at the right of the SAE, which consists of an array of cylinders enclosed in the region defined by the dashed lines. The letters in (b) define the parameters used in the inverse design process.
(Color online) Calculated pressure maps for the scattering of a sound plane wave (with wavelength ) by a scattering acoustical element that acts as a two wavelength demultiplexing device (black dots). (a) Map associated with the wave . (b) Map associated with . The arrows are guides for the eye and define the flow of transmitted wavelength. The vertical dashed lines define the plane in Fig. 1.
(Color online) These maps depict the function for the optimized seven layer SAE (black dots). (Left panel) Map obtained by multiple scattering simulations. (Right panel) Map experimentally obtained by measurements performed inside the area enclosed by the dashed lines in the left panel. The black lines define levels of equal pressure; the difference between two adjacent levels is .
(Color online) Three wavelength demultiplex SAE. The figure illustrates three maps of the transmitted pressure (the sound impinges the SAE from the bottom). Each map corresponding to one wavelength: (a) , (b) , and (c) . The color scale used goes from red (high amplitude) via green to blue (low amplitude). The black dots show a schematic view of the nine layer SAE device.
(Color online) Experimental characterization of a three wavelength demultiplex SAE. The symbols mark the measured pressure amplitudes and the solid lines define those obtained by multiple scattering simulations, for a cross section at . The three colors (symbols), blue (squares), black (circles), and red (triangles), correspond to the three spatially separated wavelengths, 22.7, 21.3, and , respectively.
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