中国物理B ›› 2022, Vol. 31 ›› Issue (3): 34303-034303.doi: 10.1088/1674-1056/ac1e14

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High-efficiency unidirectional wavefront manipulation for broadband airborne sound with a planar device

Yang Tan(谭杨), Bin Liang(梁彬)†, and Jianchun Cheng(程建春)   

  1. Key Laboratory of Modern Acoustics(Ministry of Education), Institute of Acoustics, Department of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
  • 收稿日期:2021-05-28 修回日期:2021-07-01 接受日期:2021-08-17 出版日期:2022-02-22 发布日期:2022-02-14
  • 通讯作者: Bin Liang E-mail:liangbin@nju.edu.cn
  • 基金资助:
    Project supported by National Key R&D Program of China (Grant No. 2017YFA0303700), the National Natural Science Foundation of China (Grant Nos. 11634006, 11374157, and 81127901), a project funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions, the Innovation Special Zone of National Defense Science and Technology and High-Performance Computing Center of Collaborative Innovation Center of Advanced Microstructures.

High-efficiency unidirectional wavefront manipulation for broadband airborne sound with a planar device

Yang Tan(谭杨), Bin Liang(梁彬)†, and Jianchun Cheng(程建春)   

  1. Key Laboratory of Modern Acoustics(Ministry of Education), Institute of Acoustics, Department of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
  • Received:2021-05-28 Revised:2021-07-01 Accepted:2021-08-17 Online:2022-02-22 Published:2022-02-14
  • Contact: Bin Liang E-mail:liangbin@nju.edu.cn
  • Supported by:
    Project supported by National Key R&D Program of China (Grant No. 2017YFA0303700), the National Natural Science Foundation of China (Grant Nos. 11634006, 11374157, and 81127901), a project funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions, the Innovation Special Zone of National Defense Science and Technology and High-Performance Computing Center of Collaborative Innovation Center of Advanced Microstructures.

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摘要： In the past decade, one-way manipulation of sound has attracted rapidly growing attention with application potentials in a plethora of scenarios ranging from ultrasound imaging to noise control. Here we propose a design of a planar device capable of unidirectionally harnessing the transmitted wavefront for broadband airborne sound. Our mechanism is to use the broken spatial symmetry to give rise to different critical angles for plane waves incident along opposite directions. Along the positive direction, the incoming sound is allowed to pass with high efficiency and be arbitrarily molded into the desired shape while any reversed wave undergoes a total reflection. We analytically derive the working bandwidth and incident angle range, and present a practical implementation of our strategy. The performance of our proposed device is demonstrated both theoretically and numerically via distinct examples of production of broadband anomalous refraction, acoustic focusing and non-diffractive beams for forward transmitted wave while virtually blocking the reversed waves. Bearing advantages of simple design, planar profile, broad bandwidth and high efficiency, our design opens the possibility for novel one-way acoustic device and may have important impact on diverse applications in need of special control of airborne sound.

关键词: acoustic metamaterials, one-way wavefront manipulation, broadband planar device

Abstract: In the past decade, one-way manipulation of sound has attracted rapidly growing attention with application potentials in a plethora of scenarios ranging from ultrasound imaging to noise control. Here we propose a design of a planar device capable of unidirectionally harnessing the transmitted wavefront for broadband airborne sound. Our mechanism is to use the broken spatial symmetry to give rise to different critical angles for plane waves incident along opposite directions. Along the positive direction, the incoming sound is allowed to pass with high efficiency and be arbitrarily molded into the desired shape while any reversed wave undergoes a total reflection. We analytically derive the working bandwidth and incident angle range, and present a practical implementation of our strategy. The performance of our proposed device is demonstrated both theoretically and numerically via distinct examples of production of broadband anomalous refraction, acoustic focusing and non-diffractive beams for forward transmitted wave while virtually blocking the reversed waves. Bearing advantages of simple design, planar profile, broad bandwidth and high efficiency, our design opens the possibility for novel one-way acoustic device and may have important impact on diverse applications in need of special control of airborne sound.

Key words: acoustic metamaterials, one-way wavefront manipulation, broadband planar device

中图分类号:  (Other topics in acoustics)

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