학술논문
Holey-structured tungsten metamaterials for broadband ultrasonic sub-wavelength imaging in water.
Document Type
Article
Author
Source
Subject
*ULTRASONIC imaging
*SELECTIVE laser melting
*TUNGSTEN
*WATER immersion
*ACOUSTIC impedance
*METAMATERIALS
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*
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Language
ISSN
0001-4966
Abstract
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. [ABSTRACT FROM AUTHOR]