Negative refraction of elastic waves at the deep-subwavelength scale in a single-phase metamaterial

By R. Zhu, Xiaoning Liu, G. Hu, Chin-teh Sun, Guoliang Huang, Guoliang Huang. Nature Communications, 2014

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Tailoring Structure‐Borne Sound through Bandgap Engineering in Phononic Crystals and Metamaterials: A Comprehensive Review (2022, background): “bulk modulus [52], and (g) a double negative elastic metamaterial leading to negative refraction [56].”
Dissipative elastic metamaterials for broadband wave mitigation at subwavelength scale (2016, background): “j o u r n a l h o m e p a g e : w w w . e l s e v i e r . c o m / l o c a t e / c o m p s t r u c t single-phase material and capable of experiencing both dipolar and rotational microstructural resonances has been developed [14] [15].”
A hybrid elastic metamaterial with negative mass density and tunable bending stiffness (2017, background): “…properties have been realized by designing microstructural units with built-in monopolar and dipolar resonators, respectively, for emerging applications such as elastic wave superlenses, subwavelength imaging and acoustic cloaking ( Liu et al., 2011; Zhu et al., 2014; Wu et al., 2011 ).”