Abstract
To achieve asymmetric acoustic beam shaping, we propose a type of sub-wavelength meta-atom with mode-selective feature to construct the binary metasurfaces. Two coding bits, a rectangular cavity and a waveguide with seven Helmholtz resonators, are adopted to construct the meta-atom with an asymmetric transmission (AT) feature. By adopting different coding sequences, three types of asymmetric beam shaping including focusing, splitting, and accelerating beam can be realized. Compared with previous AT devices, our approach has the advantages of simple design, broadband multifunctionality, and single layer with subwavelength scale, which may have promising applications in biomedical imaging and acoustic communication.
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