Demonstration of steering acoustic waves by generalized Eaton lens
SCIE
SCOPUS
- Title
- Demonstration of steering acoustic waves by generalized Eaton lens
- Authors
- Lee, Dongwoo; Cho, Choonlae; Mun, Jungho; Park, Namkyoo; Rho, Junsuk
- Date Issued
- 2018-10
- Publisher
- AMER INST PHYSICS
- Abstract
- We demonstrate an acoustic generalized Eaton lens that steers an acoustic wave to a desired angle, to propose a design method for gradient-index devices using the sub-wavelength structure to shape an acoustic wave. Based on investigations on the effective parameter with several methods: the S-parameter retrieval method, Floquet-Bloch calculations, and multiple scattering theory (MST) for the cylindrical rigid rod structure, we speculate the design process to realize inhomogeneous refractive index distribution. For realization of a high effective index (similar to 2), the MST design inevitably fails, whereas the Floquet-Bloch calculations and S-parameter retrieval give identical results. By appropriately designing a two-dimensional array of cylindrical PMMA rods, we experimentally verify the acoustic generalized Eaton lenses for steering angles of 15 degrees and 45 degrees. Furthermore, the use of non-resonant metamaterials enables the proposed devices to work in the broad frequency range from 4 to 8 kHz. Published by AIP Publishing.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/94277
- DOI
- 10.1063/1.5051439
- ISSN
- 0003-6951
- Article Type
- Article
- Citation
- APPLIED PHYSICS LETTERS, vol. 113, no. 16, 2018-10
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- There are no files associated with this item.
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