Journal
MATERIALS & DESIGN
Volume 199, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2020.109414
Keywords
Acoustic metasurfaces; Carpet cloaking; Ultra-broad bandwidth; Wide angle; Inverse optimization design
Categories
Funding
- National Natural Science Foundation of China [11991032, 11972246, 12072223, 11991031, 12021002]
- EIPHI Graduate School [ANR-17-EURE-0002]
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This study introduces a systematic approach to designing ultra-broadband passive metasurfaces by combining broad-band local reflection rules with optimization methods. Experimental results show that the relative bandwidth can exceed 93.33%, higher than previous passive metasurfaces, demonstrating excellent time-domain broadband characteristics.
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 broad-band local reflection rule with an optimization method. The validation of the technique is demonstrated by fab-rication 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. ? 2020 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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