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Ultra-broadband passive acoustic metasurface for wide-angle carpet cloaking
- Source :
- Materials & Design, Vol 199, Iss , Pp 109414- (2021)
- Publication Year :
- 2021
- Publisher :
- Elsevier, 2021.
-
Abstract
- 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.
Details
- Language :
- English
- ISSN :
- 02641275
- Volume :
- 199
- Issue :
- 109414-
- Database :
- Directory of Open Access Journals
- Journal :
- Materials & Design
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.fd626ab1d4294a0e9790398fee96cf24
- Document Type :
- article
- Full Text :
- https://doi.org/10.1016/j.matdes.2020.109414