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Article Dans Une Revue Materials & Design Année : 2021

Ultra-broadband passive acoustic metasurface for wide-angle carpet cloaking

Résumé

Acoustic metasurfaces can reshape a reflected wavefront rather arbitrarily, despite being much thinner than the wavelength, thus allowing on-demand wavefront modulation in a variety of applications. Recent passive metasurfaces, however, have suffered from bandwidth limitations, thus restricting their range of operation. In this work, we propose the systematic design of ultra-broadband passive metasurfaces by combining the broadband local reflection rule with an optimization method. The validation of the technique is demonstrated by fabrication and measurement of an ultra-broadband carpet cloak. Numerical and experimental results show that the relative bandwidth of the optimized carpet cloak, thinner than one fifth of the maximum wavelength, can exceed 93.33%, a value that is much larger than that of previous passive metasurfaces. Furthermore, multi-frequency pulse incidence tests reveal the excellent time-domain broadband characteristics of the metasurface over a wide range of angles of incidence. The proposed strategy opens a new route for the design of advanced passive metasurfaces for ultra-broadband wave manipulation and thus promotes practical applications of broadband acoustical devices.
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Dates et versions

hal-03186592 , version 1 (31-03-2021)

Identifiants

  • HAL Id : hal-03186592 , version 1

Citer

Hong-Tao Zhou, Wen-Xiao Fu, Yan-Feng Wang, Yue - Sheng Wang, Vincent Laude, et al.. Ultra-broadband passive acoustic metasurface for wide-angle carpet cloaking. Materials & Design, 2021, 199, pp.109414. ⟨hal-03186592⟩
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