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

Guancong Ma (), Caixing Fu, Guanghao Wang, Philipp del Hougne, Johan Christensen, Yun Lai () and Ping Sheng
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Guancong Ma: Hong Kong University of Science and Technology, Clear Water Bay
Caixing Fu: Hong Kong University of Science and Technology, Clear Water Bay
Guanghao Wang: College of Physics, Optoelectronics and Energy & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University
Philipp del Hougne: Hong Kong University of Science and Technology, Clear Water Bay
Johan Christensen: Instituto Gregorio Millán Barbany, Universidad Carlos III de Madrid, Avenida de la Universidad 30
Yun Lai: College of Physics, Optoelectronics and Energy & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University
Ping Sheng: Hong Kong University of Science and Technology, Clear Water Bay

Nature Communications, 2016, vol. 7, issue 1, 1-8

Abstract: Abstract 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.

Date: 2016
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DOI: 10.1038/ncomms13536

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