Fine manipulation of sound via lossy metamaterials with independent and arbitrary reflection amplitude and phase

Yifan Zhu, Jie Hu, Xudong Fan, Jing Yang, Bin Liang (), Xuefeng Zhu () and Jianchun Cheng ()
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Yifan Zhu: Nanjing University
Jie Hu: Nanjing University
Xudong Fan: Nanjing University
Jing Yang: Nanjing University
Bin Liang: Nanjing University
Xuefeng Zhu: Huazhong University of Science and Technology
Jianchun Cheng: Nanjing University

Nature Communications, 2018, vol. 9, issue 1, 1-9

Abstract: Abstract The fine manipulation of sound fields is critical in acoustics yet is restricted by the coupled amplitude and phase modulations in existing wave-steering metamaterials. Commonly, unavoidable losses make it difficult to control coupling, thereby limiting device performance. Here we show the possibility of tailoring the loss in metamaterials to realize fine control of sound in three-dimensional (3D) space. Quantitative studies on the parameter dependence of reflection amplitude and phase identify quasi-decoupled points in the structural parameter space, allowing arbitrary amplitude-phase combinations for reflected sound. We further demonstrate the significance of our approach for sound manipulation by producing self-bending beams, multifocal focusing, and a single-plane two-dimensional hologram, as well as a multi-plane 3D hologram with quality better than the previous phase-controlled approach. Our work provides a route for harnessing sound via engineering the loss, enabling promising device applications in acoustics and related fields.

Date: 2018
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DOI: 10.1038/s41467-018-04103-0

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