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