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18 April 2022 Gradient-index microlattice metamaterials for elastoacoustic wave focusing
Gunho Kim, Carlos M. Portela, Paolo Celli, Antonio Palermo, Chiara Daraio
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Proceedings Volume 12047, Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, Civil Infrastructure, and Transportation XVI; 1204717 (2022) https://doi.org/10.1117/12.2613170
Event: SPIE Smart Structures + Nondestructive Evaluation, 2022, Long Beach, California, United States
Abstract
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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Gunho Kim, Carlos M. Portela, Paolo Celli, Antonio Palermo, and Chiara Daraio "Gradient-index microlattice metamaterials for elastoacoustic wave focusing", Proc. SPIE 12047, Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, Civil Infrastructure, and Transportation XVI, 1204717 (18 April 2022); https://doi.org/10.1117/12.2613170
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KEYWORDS
Acoustics
Metamaterials
Microfluidics
Fluid dynamics
Refractive index
Ultrasonography
Medium wave
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