Acoustic cloaking and mirages with flying carpets
Andre Diatta, Guillaume Dupont, Sebastien Guenneau, Stefan Enoch

TL;DR
This paper introduces floating acoustic carpets that enable cloaking and mirages by mimicking objects' scattering properties, using non-singular, multi-layered isotropic fluids for practical underwater and radar applications.
Contribution
It extends the concept of acoustic cloaking to floating carpets that can hide objects or mimic other obstacles without singular parameters, using multi-layered isotropic fluids.
Findings
Carpets can hide objects and mimic other obstacles' scattering.
Non-singular, multi-layered carpets work over finite wavelength ranges.
Applications include underwater detection evasion and antenna protection.
Abstract
Carpets under consideration here, in the context of pressure acoustic waves propagating in a compressible fluid, do not touch the ground: they levitate in mid-air (or float in mid-water), which leads to approximate cloaking for an object hidden underneath, or touching either sides of a square cylinder on, or over, the ground. The tentlike carpets attached to the sides of a square cylinder illustrate how the notion of a carpet on a wall naturally generalizes to sides of other small compact objects. We then extend the concept of flying carpets to circular cylinders. However, instead of reducing its scattering cross-section like in acoustic cloaks, we rather mimic that of another obstacle, say a square rigid cylinder. For instance, show that one can hide any type of defects under such circular carpets, and yet they still scatter waves just like a smaller cylinder on its own. Interestingly,…
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Taxonomy
TopicsMetamaterials and Metasurfaces Applications · Electromagnetic Scattering and Analysis · Acoustic Wave Phenomena Research
