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Keywords = elastic hyperlens

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23 pages, 15650 KB  
Review
Recent Advances in Non-Traditional Elastic Wave Manipulation by Macroscopic Artificial Structures
by Jeonghoon Park, Dongwoo Lee and Junsuk Rho
Appl. Sci. 2020, 10(2), 547; https://doi.org/10.3390/app10020547 - 11 Jan 2020
Cited by 43 | Viewed by 10573
Abstract
Metamaterials are composed of arrays of subwavelength-sized artificial structures; these architectures give rise to novel characteristics that can be exploited to manipulate electromagnetic waves and acoustic waves. They have been also used to manipulate elastic waves, but such waves have a coupling property, [...] Read more.
Metamaterials are composed of arrays of subwavelength-sized artificial structures; these architectures give rise to novel characteristics that can be exploited to manipulate electromagnetic waves and acoustic waves. They have been also used to manipulate elastic waves, but such waves have a coupling property, so metamaterials for elastic waves uses a different method than for electromagnetic and acoustic waves. Since researches on this type of metamaterials is sparse, this paper reviews studies that used elastic materials to manipulate elastic waves, and introduces applications using extraordinary characteristics induced by metamaterials. Bragg scattering and local resonances have been exploited to introduce a locally resonant elastic metamaterial, a gradient-index lens, a hyperlens, and elastic cloaking. The principles and applications of metasurfaces that can overcome the disadvantages of bulky elastic metamaterials are discussed. Full article
(This article belongs to the Section Nanotechnology and Applied Nanosciences)
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