Article

Hybrid elastic solids.

Department of Physics, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China.
Nature Material (impact factor: 32.84). 06/2011; 10(8):620-4. DOI:10.1038/nmat3043
Source: PubMed

ABSTRACT Metamaterials can exhibit electromagnetic and elastic characteristics beyond those found in nature. In this work, we present a design of elastic metamaterial that exhibits multiple resonances in its building blocks. Band structure calculations show two negative dispersion bands, of which one supports only compressional waves and thereby blurs the distinction between a fluid and a solid over a finite frequency regime, whereas the other displays 'super anisotropy' in which compressional waves and shear waves can propagate only along different directions. Such unusual characteristics, well explained by the effective medium theory, have no comparable analogue in conventional solids and may lead to novel applications.

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Keywords

blurs
 
building blocks
 
conventional solids
 
different directions
 
displays 'super anisotropy'
 
effective medium theory
 
elastic metamaterial
 
finite frequency regime
 
Metamaterials
 
negative dispersion bands