Polarization bandgaps and fluid-like elasticity in fully solid elastic metamaterials

Guancong Ma*, Caixing Fu, Guanghao Wang, Philipp Del Hougne, Johan Christensen, Yun Lai*, Ping Sheng

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

108 Citations (Scopus)


Elastic waves exhibit rich polarization characteristics absent in acoustic and electromagnetic waves. By designing a solid elastic metamaterial based on three-dimensional anisotropic locally resonant units, here we experimentally demonstrate polarization bandgaps together with exotic properties such as 'fluid-like' elasticity. We construct elastic rods with unusual vibrational properties, which we denote as 'meta-rods'. By measuring the vibrational responses under flexural, longitudinal and torsional excitations, we find that each vibration mode can be selectively suppressed. In particular, we observe in a finite frequency regime that all flexural vibrations are forbidden, whereas longitudinal vibration is allowed - a unique property of fluids. In another case, the torsional vibration can be suppressed significantly. The experimental results are well interpreted by band structure analysis, as well as effective media with indefinite mass density and negative moment of inertia. Our work opens an approach to efficiently separate and control elastic waves of different polarizations in fully solid structures.

Original languageEnglish
Article number13536
Number of pages8
JournalNature Communications
Publication statusPublished - 21 Nov 2016

Scopus Subject Areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)


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