文献类型：期刊文献

英文题名：A reconfigurable acoustic coding metasurface for tunable and broadband sound focusing

作者：Song, Ailing[1];Bai, Yazhu[1];Sun, Chaoyu[1];Xiang, Yanxun[1];Xuan, Fu-Zhen[1]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, Shanghai Key Lab Intelligent Sensing & Detect Tech, Shanghai 200237, Peoples R China

年份：2023

卷号：134

期号：24

外文期刊名：JOURNAL OF APPLIED PHYSICS

收录：;EI(收录号：20240115317708);WOS:【SCI-EXPANDED(收录号:WOS:001135686300004)】；

基金：This work was supported by the National Key Research and Development Program of China (Grant No. 2022YFC3005002), the National Natural Science Foundation of China (NNSFC) (Grant Nos. 12104154 and 12025403), the Natural Science Foundation of Shanghai (Grant No. 22ZR1416900), and the Young Elite Scientists Sponsorship Program by CAST (Grant No. 2021QNRC001).

语种：英文

外文关键词：Diagnosis - Nondestructive examination - Ultrasonic testing

摘要：The targeted concentration of acoustic waves has significant implications for industrial nondestructive testing, ultrasound diagnosis, and medical treatment. Most conventional sound-focusing metasurfaces suffer from an untunable focus, narrow bandwidth, and fixed geometric configurations, which severely constrain their practical utility. In this paper, we propose a reconfigurable acoustic coding metasurface composed of two coding units with high transmittance and transmitted phases of 0 and pi for realizing tunable and broadband sound focusing. Through the straightforward manipulation of each unit structure and alterations in the coding sequences, precise control of the focus position across the entire working plane is attainable, enabling both tunable axial-axis and off-axis sound-focusing effects. Moreover, the sound-focusing performance of the proposed metasurface is excellent within a broad frequency range from 3000 to 5500 Hz. The experimental results are consistent with theoretical expectations and numerical simulations. This work lays a practical foundation for the design of acoustic devices for tunable and broadband sound focusing.