Broadband and flexible acoustic focusing by metafiber bundles. (21st May 2018)

• Record Type: Journal Article
• Authors: Sun, Hong-Xiang; Chen, Jia-He; Ge, Yong; Yuan, Shou-Qi; Liu, Xiao-Jun
• Is Part Of: Journal of physics. Volume 51:Number 24(2018)
• Publication Date: 2018-05-21
• Subjects: acoustic wave -- acoustic focusing -- acoustic metafiber bundle -- phase manipulation; Physics -- Periodicals; 530
• DOI: 10.1088/1361-6463/aac1aa
• Languages: English
• ISSNs: 0022-3727

Abstract

Abstract: We report a broadband and flexible acoustic focusing through metafiber bundles in air, in which each metafiber consists of eight circular and narrow rectangular cavities. The fractional bandwidth of the acoustic focusing could reach about 0.2, which arises from the eigenmodes of the metafiber structure. Besides, owing to the flexible characteristic of the metafibers, the focus position can be manipulated by bending the metafiber bundles, and the metafiber bundles could bypass rigid scatterers inside the lens structure. More interestingly, the acoustic propagation and focusing directions can be changed by using a designed right-angled direction converter fabricated by the metafibers, and a waveform converter and a focusing lens of the cylindrical acoustic source are realized based on the metafiber bundles. The proposed focusing lens has the advantages of broad bandwidth, flexible structure, and high focusing performance, showing great potentials in versatile applications.