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Published November 2021 | Accepted Version + Supplemental Material
Journal Article Open

Poroelastic microlattices for underwater wave focusing


Metamaterials with microscale architectures, e.g., microlattices, can exhibit extreme quasi-static mechanical response and tailorable acoustic properties. When coupled with pressure waves in surrounding fluid, the dynamic behavior of microlattices in the long wavelength limit can be explained in the context of Biot's theory of poroelasticity. In this work, we exploit the elastoacoustic wave propagation within 3D-printed polymeric microlattices to incorporate a gradient of refractive index for underwater ultrasonic lensing. Experimentally and numerically derived dispersion curves allow the characterization of acoustic properties of a fluid-saturated elastic lattice. A modified Luneburg lens index profile adapted for underwater wave focusing is demonstrated via the finite element method and immersion testing, showcasing a computationally efficient poroelasticity-based design approach that enables accelerated design of acoustic wave manipulation devices. Our approach can be applied to the design of acoustic metamaterials for biomedical applications featuring focused ultrasound.

Additional Information

© 2021 Published by Elsevier Ltd. Received 3 June 2021, Revised 21 September 2021, Accepted 1 October 2021, Available online 14 October 2021. This work was supported by the Rosen Center for Bioengineering, USA. Gunho Kim was funded by the Kwanjeong Educational Foundation, South Korea . GK and CD thank the founders of the Rosen center, Donna and Benjamin M. Rosen, and the president of Kwanjeong Foundation, Chonghwan Lee, for their vision and support. AP, PC and GK thank Daniel Marti Dafcik for his support during the earliest stages of this project. The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Attached Files

Accepted Version - 1-s2.0-S2352431621001930-main.pdf

Supplemental Material - 1-s2.0-S2352431621001930-mmc1.pdf


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August 22, 2023
October 23, 2023