Volume 91, Number 5, September 2010
|Number of page(s)||5|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||22 September 2010|
Negative-dynamic-mass response without localized resonance
Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education and School of Physics and Technology, Wuhan University - Wuhan 430072, China
Accepted: 29 August 2010
We propose a new mechanism to achieve negative-dynamic-mass response. The system consists of a water-immersed soft solid plate patterned with periodical heavy gratings. The negative dynamic mass stems from collective excitations of the coupled acoustic surface waves in the thin plate, but not from local resonances as usual. A simple spring-mass model is further applied to understand this exotic phenomenon. Extensive applications of the new mechanism can be anticipated, such as in designing acoustic metamaterials with negative indices.
PACS: 43.40.+s – Structural acoustics and vibration / 46.40.-f – Vibrations and mechanical waves / 68.60.Bs – Mechanical and acoustical properties
© EPLA, 2010
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