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Controllably asymmetric beam splitting via gap-induced diffraction channel transition in dual-layer binary metagratings |
Yang-Yang Fu1(), Jia-Qi Tao1, Ai-Ling Song3, You-Wen Liu1, Ya-Dong Xu2() |
1. College of Science, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China 2. School of Physical Science and Technology, Soochow University, Suzhou 215006, China 3. School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an 710049, China |
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Abstract In this work, we designed and studied a feasible dual-layer binary metagrating, which can realize controllable asymmetric transmission and beam splitting with nearly perfect performance. Owing to ingenious geometry configuration, only one meta-atom is required to design for the metagrating system. By simply controlling air gap between dual-layer metagratings, high-efficiency beam splitting can be well switched from asymmetric transmission to symmetric transmission. The working principle lies on gap-induced diffraction channel transition for incident waves from opposite directions. The asymmetric/symmetric transmission can work in a certain frequency band and a wide incident range. Compared with previous methods using acoustic metasurfaces, our approach has the advantages of simple design and tunable property and shows promise for applications in wavefront manipulation, noise control and one-way propagation.
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Keywords
beam splitting
asymmetric transmission
acoustic metagrating
binary design
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Corresponding Author(s):
Yang-Yang Fu,Ya-Dong Xu
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Issue Date: 17 June 2020
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