Phononic Thin Plates with Embedded Acoustic Black Holes

Abstract

We introduce a class of two-dimensional non-resonant single-phase phononic materials and investigate its peculiar dispersion characteristics. The material consists of a thin plate-like structure with an embedded periodic lattice of Acoustic Black Holes. The use of these periodic tapers allows achieving remarkable dispersion properties such as Zero Group Velocity in the fundamental modes, negative group refraction index, bi-refraction, and mode anisotropy. The dispersion properties are numerically investigated using a three-dimensional supercell plane wave expansion method. The effect on the dispersion characteristics of key geometric parameters of the black hole, such as the taper profile and the residual thickness, are also explored.

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Cited by in corpus (5)

• Anomalous refraction of acoustic guided waves in solids with geometrically tapered metasurfaces
• Design and Experimental Observation of Valley-Hall Edge States in Diatomic-Graphene-like Elastic Waveguides
• Two-Dimensional Structure-Embedded Acoustic Lenses based on Periodic Acoustic Black Holes
• Experimental evidence of robust acoustic valley Hall edge states in a non-resonant topological elastic waveguide
• Double-zero-index structural waveguides