Anomalous wave propagation in a one-dimensional acoustic metamaterial having simultaneously negative mass density and Young’s modulus

Journal of the Acoustical Society of America - Tập 132 Số 4 - Trang 2887-2895 - 2012
Hsin-Haou Huang1, C.T. Sun2
1Department of Engineering Science and Ocean Engineering, National Taiwan University, Taipei 10617, Taiwan
2School of Aeronautics and Astronautics, Purdue University, West Lafayette, Indiana 47907

Tóm tắt

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.

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