Holey-structured tungsten metamaterials for broadband ultrasonic sub-wavelength imaging in water

  • Astolfi L
  • Hutchins D
  • Thomas P
  • et al.
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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.

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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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