Holey-structured tungsten metamaterials for broadband ultrasonic sub-wavelength imaging in water.
Holey-structured tungsten metamaterials for broadband ultrasonic sub-wavelength imaging in water.
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DOI：
10.1121/10.0005483
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发表时间：
2021-07
期刊：
影响因子：
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通讯作者：
Lorenzo Astolfi;D. Hutchins;P. Thomas;R. Watson;Luzhen Nie;S. Freear;A. Clare;M. Ricci;S. Laur
中科院分区：
文献类型：
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作者：
Lorenzo Astolfi;D. Hutchins;P. Thomas;R. Watson;Luzhen Nie;S. Freear;A. Clare;M. Ricci;S. Laur
显示法布里-珀罗共振的超材料被示出在宽带宽范围内实现水浸中的亚波长孔径的超声成像。使用钨衬底和选择性激光熔化来增材制造不同厚度的孔结构超材料，选择钨以产生与水的显著声阻抗失配。宽带超材料的行为和亚波长成像在水中的实验证明，并在200-300 kHz范围内的有限元模拟验证。
Metamaterials exhibiting Fabry-Pérot resonances are shown to achieve ultrasonic imaging of a sub-wavelength aperture in water immersion across a broad bandwidth. Holey-structured metamaterials of different thickness were additively manufactured using a tungsten substrate and selective laser melting, tungsten being chosen so as to create a significant acoustic impedance mismatch with water. Both broadband metamaterial behavior and sub-wavelength imaging in water are demonstrated experimentally and validated with finite element simulations over the 200-300 kHz range.