Journal
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
Volume 132, Issue 4, Pages 2887-2895Publisher
ACOUSTICAL SOC AMER AMER INST PHYSICS
DOI: 10.1121/1.4744977
Keywords
acoustic wave propagation; finite element analysis; metamaterials; Young's modulus
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Funding
- AFOSR [FA9550-10-1-0061]
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A mechanical model representing an acoustic metamaterial that exhibits simultaneously negative mass density and negative Young's modulus was proposed. Wave propagation was studied in the frequency range of double negativity. In view of positive energy flow, it was found that the phase velocity in this range is negative. This phenomenon was also observed using transient wave propagation finite-element analyses of a transient sinusoidal wave and a transient wave packet. In contrast to wave propagation in the region of positive mass and modulus, the peculiar backward wave motion in the region of double negativity was clearly displayed. (C) 2012 Acoustical Society of America. [http://dx.doi.org/10.1121/1.4744977]
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