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Controllably asymmetric beam splitting via gap-induced diffraction channel transition in dual-layer binary metagratings

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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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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant Nos. 11904169, 11974010, 61675095, and 11604229) and the Natural Science Foundation of Jiangsu Province (Grant Nos. BK20190383 and BK20171206).

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Authors and Affiliations

  1. College of Science, Nanjing University of Aeronautics and Astronautics, Nanjing, 211106, China

    Yang-Yang Fu, Jia-Qi Tao & You-Wen Liu

  2. School of Physical Science and Technology, Soochow University, Suzhou, 215006, China

    Ya-Dong Xu

  3. School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an, 710049, China

    Ai-Ling Song

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  1. Yang-Yang Fu
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  2. Jia-Qi Tao
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  3. Ai-Ling Song
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  4. You-Wen Liu
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  5. Ya-Dong Xu
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Correspondence to Yang-Yang Fu or Ya-Dong Xu.

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Fu, YY., Tao, JQ., Song, AL. et al. Controllably asymmetric beam splitting via gap-induced diffraction channel transition in dual-layer binary metagratings. Front. Phys. 15, 52502 (2020). https://doi.org/10.1007/s11467-020-0968-2

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