Superwavelength self-healing of spoof surface sonic Airy-Talbot waves

Hao-xiang Li, Jing-jing Liu, Zhao-xian Chen, Kai Wu, Bin Liang (), Jing Yang (), Jian-chun Cheng () and Johan Christensen ()
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Hao-xiang Li: Nanjing University
Jing-jing Liu: Nanjing University
Zhao-xian Chen: Nanjing University
Kai Wu: Nanjing University
Bin Liang: Nanjing University
Jing Yang: Nanjing University
Jian-chun Cheng: Nanjing University
Johan Christensen: IMDEA Materials Institute

Nature Communications, 2023, vol. 14, issue 1, 1-7

Abstract: Abstract Self-imaging phenomena for nonperiodic waves along a parabolic trajectory encompass both the Talbot effect and the accelerating Airy beams. Beyond the ability to guide waves along a bent trajectory, the self-imaging component offers invaluable advantages to lensless imaging comprising periodic repetition of planar field distributions. In order to circumvent thermoviscous and diffraction effects, we structure subwavelength resonators in an acoustically impenetrable surface supporting spoof surface acoustic waves (SSAWs) to provide highly confined Airy-Talbot effect, extending Talbot distances along the propagation path and compressing subwavelength lobes in the perpendicular direction. From a linear array of loudspeakers, we judiciously control the amplitude and phase of the SSAWs above the structured surface and quantitatively evaluate the self-healing performance of the Airy-Talbot effect by demonstrating how the distinctive scattering patterns remain largely unaffected against superwavelength obstacles. Furthermore, we introduce a new mechanism utilizing subwavelength Airy beam as a coding/decoding degree of freedom for acoustic communication with high information density comprising robust transport of encoded signals.

Date: 2023
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DOI: 10.1038/s41467-023-43379-9

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