Journal
PHYSICS LETTERS A
Volume 376, Issue 45, Pages 2834-2837Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physleta.2012.08.057
Keywords
Acoustic metamaterials; Near-zero-index
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This Letter studies a two-dimensional, membrane-based acoustic metamaterial with a near-zero refractive index. It yields a frequency-dependent effective density that is near-zero at a narrow frequency band centered around its first resonant frequency. This effective density results in its near-zero refractive index. Numerical simulations are shown which demonstrate that the phase in this metamaterial undergoes small changes, and the metamaterial functions as an angular filter such that only a wave with a near-zero incident angle can transmit. Its ability to tailor acoustic phase pattern is also discussed in this Letter. (C) 2012 Elsevier B.V. All rights reserved.
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