Acoustic Bilayer Gradient Metasurfaces for Perfect and Asymmetric Beam Splitting

We experimentally and theoretically present a paradigm for the accurate bilayer design of gradient metasurfaces for wave beam manipulation, producing an extremely asymmetric splitting effect by simply tailoring the interlayer size. This concept arises from anomalous diffraction in phase gradient met...

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Veröffentlicht in:Chinese physics letters 2024-01, Vol.41 (1), p.14301-50
Hauptverfasser: Quan, Jiaqi, Sun, Baoyin, Fu, Yangyang, Gao, Lei, Xu, Yadong
Format: Artikel
Sprache:eng
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Zusammenfassung:We experimentally and theoretically present a paradigm for the accurate bilayer design of gradient metasurfaces for wave beam manipulation, producing an extremely asymmetric splitting effect by simply tailoring the interlayer size. This concept arises from anomalous diffraction in phase gradient metasurfaces and the precise combination of the phase gradient in bilayer metasurfaces. Ensured by different diffraction routes in momentum space for incident beams from opposite directions, extremely asymmetric acoustic beam splitting can be generated in a robust way, as demonstrated in experiments through a designed bilayer system. Our work provides a novel approach and feasible platform for designing tunable devices to control wave propagation.
ISSN:0256-307X
1741-3540
DOI:10.1088/0256-307X/41/1/014301