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.
CITATION STYLE
Astolfi, L., Hutchins, D. A., Thomas, P. J., Watson, R. L., Nie, L., Freear, S., … Laureti, S. (2021). Holey-structured tungsten metamaterials for broadband ultrasonic sub-wavelength imaging in water. The Journal of the Acoustical Society of America, 150(1), 74–81. https://doi.org/10.1121/10.0005483
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