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Simultaneous realization of negative group velocity, fast and slow acoustic waves in a metamaterial.
- Source :
-
Applied Physics Letters . 6/6/2016, Vol. 108 Issue 23, p231904-1-231904-5. 5p. 1 Diagram, 3 Graphs. - Publication Year :
- 2016
-
Abstract
- An acoustic metamaterial is designed based on a simple and compact structure of one string of side pipes arranged along a waveguide, in which diverse group velocities are achieved. Owing to Fabry-Perot resonance of the side pipes, a negative phase time is achieved, and thus, acoustic waves transmitting with negative group velocities are produced near the resonant frequency. In addition, both fast and slow acoustic waves are also observed in the vicinity of the resonance frequency. The extraordinary group velocities can be explained based on spectral rephasing induced by anomalous dispersion on the analogy of Lorentz dispersion in electromagnetic waves. [ABSTRACT FROM AUTHOR]
- Subjects :
- *GROUP velocity
*METAMATERIALS
*WAVEGUIDES
*FABRY-Perot resonators
*LORENTZ theory
Subjects
Details
- Language :
- English
- ISSN :
- 00036951
- Volume :
- 108
- Issue :
- 23
- Database :
- Academic Search Index
- Journal :
- Applied Physics Letters
- Publication Type :
- Academic Journal
- Accession number :
- 116093623
- Full Text :
- https://doi.org/10.1063/1.4953631