Abstract
Acoustic metamaterials and metasurfaces provide great flexibility for manipulating sound waves and promise unprecedented functionality, ranging from transformation acoustics, acoustic cloaking, acoustic imaging to acoustic rerouting. However, the design of artificial structures with both broad bandwidth and multifunctionality remains challenging with traditional design approaches. Here we present a design and realization of a broadband acoustic metafiber bundle. Very different from previously reported acoustic metamaterials and metasurfaces, not only the metafiber structure is simple, flexible and tunable, but also the metafiber bundle has the advantages of broad bandwidth, high transmission, no resonance-induced energy loss and unchangeable output wavefront owing to eigenmodes in the passbands of the metafiber. Besides, it could also achieve arbitrary complex modulations of cylindrical and plane acoustic wavefronts. The metafiber bundles realize the exciting multifunctionality of both acoustic metamaterials and metasurfaces in a broad frequency range, which provides diverse routes to design novel acoustic devices with versatile applications.
Highlights
Most acoustic metamaterials and metasurfaces have been denoted as a class of structured composites whose acoustic functionalities arise from the collective manifestations of their locally resonant elements
Owing to the eigenmodes in the passbands, the metafiber bundle has the advantages of high transmission, no resonance-induced energy loss and unchangeable output wavefront
We have proposed and demonstrated a broadband acoustic metafiber bundle, which has the exciting multifunctionality of both acoustic metamaterials and metasurfaces
Summary
Most acoustic metamaterials and metasurfaces have been denoted as a class of structured composites whose acoustic functionalities arise from the collective manifestations of their locally resonant elements. Other locally resonant elements, such as Helmholtz resonators[19, 21, 41, 51], tensioned membranes[20, 24, 29, 38, 58], space-coiling structures[27, 30, 34, 37, 39, 40, 62], hybrid elastic unit cells[25] and porous structures[23, 42], have been successfully used to fabricate acoustic metamaterials and metasurfaces These locally resonant elements have realized subwavelength sizes and diversiform novel functionalities, but they depend heavily on their resonant effects, and these functionalities decrease sharply when away from their resonant frequencies. The acoustic metafiber bundles with both broad bandwidth and multifunctionality are highly desirable in engineering applications, such as designs of acoustic cloaking, acoustic superlens, acoustic beam splitter and acoustic self-bending and vortexing beam generators
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