Systematic design and experimental demonstration of bianisotropic metasurfaces for scattering-free manipulation of acoustic wavefronts

Junfei Li, Chen Shen, Ana Díaz-Rubio, Sergei A. Tretyakov () and Steven A. Cummer ()
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Junfei Li: Duke University
Chen Shen: Duke University
Ana Díaz-Rubio: Aalto University
Sergei A. Tretyakov: Aalto University
Steven A. Cummer: Duke University

Nature Communications, 2018, vol. 9, issue 1, 1-9

Abstract: Abstract Recent advances in gradient metasurfaces have shown that by locally controlling the bianisotropic response of the cells one can ensure full control of refraction, that is, arbitrarily redirect the waves without scattering into unwanted directions. In this work, we propose and experimentally verify the use of an acoustic cell architecture that provides enough degrees of freedom to fully control the bianisotropic response and minimizes the losses. The versatility of the approach is shown through the design of three refractive metasurfaces capable of redirecting a normally incident plane wave to 60°, 70°, and 80° on transmission. The efficiency of the bianisotropic designs is over 90%, much higher than the corresponding generalized Snell’s law based designs (81%, 58%, and 35%). The proposed strategy opens a new way of designing practical and highly efficient bianisotropic metasurfaces for different functionalities, enabling nearly ideal control over the energy flow through thin metasurfaces.

Date: 2018
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DOI: 10.1038/s41467-018-03778-9

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