Achromatic metasurfaces by dispersion customization for ultra-broadband acoustic beam engineering

Hao Wen Dong, Chen Shen, Sheng Dong Zhao, Weibao Qiu, Hairong Zheng, Chuanzeng Zhang, Steven A. Cummer, Yue Sheng Wang*, Daining Fang*, Li Cheng*

*此作品的通讯作者

科研成果: 期刊稿件文章同行评审

76 引用 (Scopus)

摘要

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.

源语言英语
文章编号nwac030
期刊National Science Review
9
12
DOI
出版状态已出版 - 1 12月 2022

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Dong, H. W., Shen, C., Zhao, S. D., Qiu, W., Zheng, H., Zhang, C., Cummer, S. A., Wang, Y. S., Fang, D., & Cheng, L. (2022). Achromatic metasurfaces by dispersion customization for ultra-broadband acoustic beam engineering. National Science Review, 9(12), 文章 nwac030. https://doi.org/10.1093/nsr/nwac030