Structured materials with atomic-lattice mimicking features at the microscale, e.g., microlattices, have demonstrated extreme mechanical properties. Elastoacoustic hybridization of water-saturated microlattices can be exploited to achieve a gradient of refractive index for underwater wave focusing. We characterize the acoustic properties of fluid-saturated elastic lattices and construct an ultrasonic wave focusing device with a modified Luneburg lens index profile. Our approach showcases a computationally efficient homogenization design approach that enables accelerated design of acoustic wave manipulation devices. By matching the acoustic impedance with surrounding fluid, microlattices with extraordinary stiffness-to-density ratio and enhanced transmission will prove useful for biomedical applications.
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