Journal
APPLIED SCIENCES-BASEL
Volume 10, Issue 2, Pages -Publisher
MDPI
DOI: 10.3390/app10020547
Keywords
elastic metamaterial; phononic crystals; gradient-index lens; elastic hyperlens; elastic cloaking; elastic metasurface
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Funding
- Korea Hydro & Nuclear Power Co. Ltd., Republic of Korea [2018-TECH-04]
- National Research Foundation of Korea (NRF) - Ministry of Science and ICT (MSIT) of the Korean government [NRF-2019R1A2C3003129, CAMM-2019M3A6B3030637, NRF-2019R1A5A8080290, NRF-2018M3D1A1058998, NRF-2015R1A5A1037668]
- NRF-MSIT of the Korean government [NRF-2018H1A2A1062053]
- National Research Foundation of Korea [2015R1A5A1037668] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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.
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