期刊
NATIONAL SCIENCE REVIEW
卷 9, 期 12, 页码 -出版社
OXFORD UNIV PRESS
DOI: 10.1093/nsr/nwac030
关键词
ultra-broadband metasurfaces; achromatic; inverse design; customized dispersion; multiple scattering
资金
- National Natural Science Foundation of China [11802012, 12172044, 11991031, 11902171, 11534013]
- Research Grants Council of Hong Kong Special Administrative Region (PolyU) [152013/21E]
- Beijing Institute of Technology Research Fund Program for Young Scholars
- Hong Kong Scholars Program [XJ2018041]
- Postdoctoral Science Foundation [2017M620607]
- Sino-German Joint Research Program [1355]
- German Research Foundation (DFG) [ZH 15/27-1]
- Emerging Frontiers in Research and Innovation Grant from National Science Foundation [1641084]
- Shenzhen Key Laboratory of Ultrasound Imaging and Therapy [ZDSYS201802061806314]
- Emerging Frontiers & Multidisciplinary Activities
- Directorate For Engineering [1641084] Funding Source: National Science Foundation
This paper presents inversely designed metasurfaces with customized dispersion for realizing frequency-independent and ultra-broadband acoustic functionalities. The study demonstrates three ultra-broadband functionalities, including acoustic beam deflection, focusing, and levitation, with relative bandwidths of 93.3%, 120%, and 118.9%, respectively. The metasurface elements have anisotropic and asymmetric geometries, supporting ultra-broadband customized dispersion.
This paper reports inversely designed metasurfaces with customized dispersion through bottom-up topology optimization to realize frequency-independent and ultra-broadband acoustic functionalities including directional energy transmission and convergence and ultrasound particle levitation. Metasurfaces, the ultra-thin media with extraordinary wavefront modulation ability, have shown great promise for many potential applications. However, most of the existing metasurfaces are limited by narrow-band and strong dispersive modulation, which complicates their real-world applications and, therefore require strict customized dispersion. To address this issue, we report a general methodology for generating ultra-broadband achromatic metasurfaces with prescribed ultra-broadband achromatic properties in a bottom-up inverse-design paradigm. We demonstrate three ultra-broadband functionalities, including acoustic beam deflection, focusing and levitation, with relative bandwidths of 93.3%, 120% and 118.9%, respectively. In addition, we reveal a relationship between broadband achromatic functionality and element dispersion. All metasurface elements have anisotropic and asymmetric geometries with multiple scatterers and local cavities that synthetically support internal resonances, bi-anisotropy and multiple scattering for ultra-broadband customized dispersion. Our study opens new horizons for ultra-broadband highly efficient achromatic functional devices, with promising extension to optical and elastic metamaterials.
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