1. Ultra-broadband passive acoustic metasurface for wide-angle carpet cloaking
- Author
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Yan-Feng Wang, Chuanzeng Zhang, Yue-Sheng Wang, Wen-Xiao Fu, Vincent Laude, Hong-Tao Zhou, Tianjin University (TJU), Franche-Comté Électronique Mécanique, Thermique et Optique - Sciences et Technologies (UMR 6174) (FEMTO-ST), Université de Technologie de Belfort-Montbeliard (UTBM)-Ecole Nationale Supérieure de Mécanique et des Microtechniques (ENSMM)-Université de Franche-Comté (UFC), Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC)-Centre National de la Recherche Scientifique (CNRS), Universität Siegen [Siegen], and Femto-st, MN2S
- Subjects
Fabrication ,Materials science ,[SPI.NANO] Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics ,Cloaking ,02 engineering and technology ,[SPI.MAT] Engineering Sciences [physics]/Materials ,010402 general chemistry ,01 natural sciences ,[SPI.MAT]Engineering Sciences [physics]/Materials ,Carpet cloaking ,Relative bandwidth ,Optics ,Broadband ,lcsh:TA401-492 ,Inverse optimization design ,General Materials Science ,[SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics ,Wide angle ,Wavefront ,[SPI.ACOU]Engineering Sciences [physics]/Acoustics [physics.class-ph] ,[SPI.ACOU] Engineering Sciences [physics]/Acoustics [physics.class-ph] ,business.industry ,Mechanical Engineering ,Bandwidth (signal processing) ,Cloak ,021001 nanoscience & nanotechnology ,Acoustic metasurfaces ,0104 chemical sciences ,Wavelength ,Mechanics of Materials ,Ultra-broad bandwidth ,lcsh:Materials of engineering and construction. Mechanics of materials ,0210 nano-technology ,business - Abstract
International audience; 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.
- Published
- 2021