AUTHOR=Chen Shuang , Fan Yuancheng , Yang Fan , Sun Kangyao , Fu Quanhong , Zheng Jianbang , Zhang Fuli TITLE=Coiling-Up Space Metasurface for High-Efficient and Wide-angle Acoustic Wavefront Steering JOURNAL=Frontiers in Materials VOLUME=8 YEAR=2021 URL=https://www.frontiersin.org/journals/materials/articles/10.3389/fmats.2021.790987 DOI=10.3389/fmats.2021.790987 ISSN=2296-8016 ABSTRACT=

The recent advent of acoustic metasurface displays tremendous potential with their unique and flexible capabilities of wavefront manipulations. In this paper, we propose an acoustic metagrating made of binary coiling-up space structures to coherently control the acoustic wavefront steering. The acoustic wave steering is based on the in-plane coherent modulation of waves in different diffraction channels. The acoustic metagrating structure with a subwavelength thickness is realized with 3D printed two coiling-up space metaunits. By adjusting structural parameters of the metaunits, the −1st-order diffraction mode can be retained, and the rest of the diffraction orders are eliminated as much as possible through destructive interference, forming a high-efficiency anomalous reflection in the scattering field. The anomalous reflection performance of the designed metagrating is achieved over a wide range of incident angles with high efficiency.