Acoustic Metamaterials: Negative Refraction, Imaging, Lensing and Cloaking

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Emergence of seismic metamaterials: Current state and future perspectives (2017, background): “gating within three-dimensional cubic arrays of thin coated spheres [26] and fluid filled Helmholtz resonators [27] paved the way towards acoustic analogues of electromagnetic metamaterials ([28] and [29]), including elastic cloaks ([30] to [32]). The control of elastic wave trajectories in thin pla”
Gradient index phononic crystals and metamaterials (2018, background): “Over the past two decades, dramatically increasing efforts have been devoted to the study of acoustic artificial structured materials driven by both fundamental scientific curiosities with properties not found previously and diverse potential applications with novel functionalities[4-16].”