title: Ultrabroadband elastic cloaking in thin plates.
abstract: Control of waves with metamaterials is of great topical interest, and is fueled by rapid progress in broadband acoustic and electromagnetic cloaks. We propose a design for a cloak to control bending waves propagating in isotropic heterogeneous thin plates. This is achieved through homogenization of a multilayered concentric coating filled with piecewise constant isotropic elastic material. Significantly, our cloak displays no phase shift for both backward and forward scattering. To foster experimental efforts, we provide a simplified design of the cloak which is shown to work in a more than two-octave frequency range (30 Hz to 150 Hz) when it consists of 10 layers using only 6 different materials overall. This metamaterial should be easy to manufacture, with potential applications ranging from car industry to anti-earthquake passive systems for smart buildings, depending upon the plate dimensions and wavelengths.
authors: Institut Fresnel, CNRS, Aix-Marseille Université, Campus universitaire de Saint-Jérôme, 13013 Marseille, France.
authors: Mohamed
authors: M
authors: Farhat
authors: Sebastien
authors: S
authors: Guenneau
authors: Stefan
authors: S
authors: Enoch