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

ABSTRACT: 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 f

SUBMITTER: Dong HW 

PROVIDER: S-EPMC9883680 | biostudies-literature | 2022 Dec

REPOSITORIES: biostudies-literature