Negative Refraction Acoustic Lens Based on Elastic Shell Encapsulated Bubbles

• DOI: 10.1002/admt.202101186
• Publication Date: 2022-03-03T07:47:51Z
• Authors: Zheren Cai; Shengdong Zhao; Zhandong Huang; Zheng Li; Meng Su; Zeying Zhang; Zhipeng Zhao; Yanlin Song
• Keywords: Negative Refraction; Cloaking; Acoustic Metamaterials; Slab

Abstract Advanced devices for acoustic negative refraction and cloaking can be achieved by utilizing metamaterials. However, the capacities of metamaterials often are weakened or even disappear when considering thermoviscous loss damping, which limits applications Here, imaging capacity that comprised 2D underwater elastic shell encapsulated bubble arrays numerically experimentally is verified. The influence damping in solid structures on discussed. transmission reduced structural optimization. Accordingly, focusing sound emitted a point source using flat metamaterial slab whose effective refractive index −1, promising imaging.