Ultra-broadband illusion acoustics for space and time camouflages

Invisibility cloaks that can suppress wave scattering by objects have attracted a tremendous amount of interest in the past two decades. In comparison to prior methods that were severely limited by narrow bandwidths, here we present a practical strategy to suppress sound scattering across an ultra-b...

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Bibliographic Details
Published in:Nature communications 2024-09, Vol.15 (1), p.8046-8, Article 8046
Main Authors: Liu, Chenkai, Ma, Chu, Lai, Yun, Fang, Nicholas X.
Format: Article
Language:English
Subjects:
639/766/25/3927
639/766/930/12
Acoustic waves
Acoustics
Bandwidths
Broadband
Humanities and Social Sciences
Metamaterials
multidisciplinary
Science
Science (multidisciplinary)
Sound scatter
Stealth technology
Visibility
Wave fronts
Wave scattering
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Summary:Invisibility cloaks that can suppress wave scattering by objects have attracted a tremendous amount of interest in the past two decades. In comparison to prior methods that were severely limited by narrow bandwidths, here we present a practical strategy to suppress sound scattering across an ultra-broad spectrum by leveraging illusion metamaterials. Consisting of a collection of subwavelength tunnels with precisely crafted internal structures, this illusion metamaterial has the ability to guide acoustic waves around the obstacles and accurately recreate the incoming wavefront on the exit surface. Remarkably, two ultra-broadband illusionary effects are produced, disappearing space and time shift. Sound scatterings are removed at all frequencies below a limit determined by the tunnel width, as confirmed by full-wave simulations and acoustic experiments. Our strategy represents a universal approach to solve the key bottleneck of bandwidth limitation in the field of cloaking in transmission, and establishes a metamaterial platform that enables the long-desired ultra-broadband sound manipulation such as acoustic camouflage and reverberation control, opening up exciting new possibilities in practical applications. Invisibility cloaks have attracted a tremendous amount of interest. Here, the authors present a strategy to realize ultra-broadband disappearing-space and time-shift camouflages by leveraging illusion metamaterials, thereby removing the longstanding bottleneck of limited bandwidth in invisibility.
ISSN:2041-1723
2041-1723
DOI:10.1038/s41467-024-49856-z