Experimental demonstration of a three-dimensional acoustic hyperlens for super-resolution imaging

Acoustic hyperlenses have recently attracted much attention for promising applications in various fields. Yet the experimental realization of an acoustic hyperlens working in a real three-dimensional (3D) world is still lacking. Here, we theoretically propose and experimentally demonstrate a 3D acou...

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Bibliographic Details
Published in:Applied physics letters 2021-05, Vol.118 (20)
Main Authors: Hu, Chengbo, Weng, Jingkai, Ding, Yujiang, Liang, Bin, Yang, Jing, Cheng, Jianchun
Format: Article
Language:English
Subjects:
Acoustics
Anisotropy
Applied physics
Broadband
Evanescent waves
Frequency ranges
Image resolution
Metamaterials
Propagation modes
Tessellation
Wave propagation
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Summary:Acoustic hyperlenses have recently attracted much attention for promising applications in various fields. Yet the experimental realization of an acoustic hyperlens working in a real three-dimensional (3D) world is still lacking. Here, we theoretically propose and experimentally demonstrate a 3D acoustic hyperlens capable of producing super-resolution imaging for broadband airborne sound. A simple nonresonant metamaterial is designed as a practical implementation that simultaneously ensures tessellation of the curved surface and deep-subwavelength resolution. We analyze the dispersion relationship of the designed metamaterial that converts the evanescent waves into radially propagating modes based on positive extreme anisotropy. The effectiveness of our mechanism is demonstrated both numerically and experimentally via the production of 3D magnifying super-resolution imaging of small objects containing subwavelength patterns within a broad frequency range. We envision the realization of a 3D acoustic hyperlens to offer possibilities for the design of acoustic super-resolution imaging devices and their application in diverse scenarios ranging from medical ultrasound imaging to noninvasive evaluation.
ISSN:0003-6951
1077-3118
DOI:10.1063/5.0047131