Bifunctional acoustic metamaterial lens designed with coordinate transformation
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We propose a method to design bifunctional acoustic lens using acoustic metamaterials that possess separate functions at different directions. The proposed bifunctional acoustic lens can be implemented in practice with subwavelength unit cells exhibiting effective anisotropic parameters. With this methodology, we experimentally demonstrate an acoustic Luneburg-fisheye lens at operational frequencies from 6300 Hz to 7300 Hz. Additionally, a bifunctional acoustic square lens is proposed with different focal lengths for multi directions. This method paves the way to manipulating acoustic energy flows with functional lenses.
Date issued
2017-03Department
Massachusetts Institute of Technology. Department of Mechanical EngineeringJournal
Applied Physics Letters
Publisher
AIP Publishing
Citation
Zhu, Rongrong, et al. “Bifunctional Acoustic Metamaterial Lens Designed with Coordinate Transformation.” Applied Physics Letters, vol. 110, no. 11, Mar. 2017, p. 113503. © 2017 Authors
Version: Final published version
ISSN
0003-6951
1077-3118