Experimental demonstration of an acoustic magnifying hyperlens.

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Experimental realization of full control of reflected waves with subwavelength acoustic metasurfaces (2014, background): “The recent emergence of acoustic metamaterials [9-19] with properties unavailable in nature have broadened the horizon of acoustic waves and enabled fascinating phenomena such as sub-diffraction imaging [20-22], one-way transportation [23-27], cloaking [28-30], and super absorption [31, 32], etc.”
A review on application of mechanical metamaterials for vibration control (2021, background): “Early metamaterials were introduced in the electromagnetic field for achieving negative permittivity and permeability for the experimental purpose [13], and later, the metamaterial concept was also extended to solid mechanics [14], elastic waves [15], acoustics [16, 17] and as a vibration absorber.”
A holey-structured metamaterial for acoustic deep-subwavelength imaging (2011, background): “Similar two-dimensional (2D) acoustic hyperlens designs have also been explore”