Phononic Microlattices for Ultrasonic Applications

Abstract eng:
Microlattice materials are assembled from slender, truss-like elements arranged in different three-dimensional geometries on a microscale. Recent advances in microfabircation tecniques allowed to obtain extreme properties in this new class of materials. Ultimately their periodicity and micro-size suggests to find applications in dynamic applications, especially in ultrasonic wave propagation. In this work, we study the response of microlattices to ultrasonic excitations, and tailor their acoustic transmission properties independently of the lattice’s quasi-static response. We fabricate polymeric microlattices using 3D direct laser writing and test their response experimentally. The studied microlattices are acoustically transparent in water over large frequency regions, due to their water-like acoustic properties. Our findings can be applied in biomedical imaging devices, targeted cell surgery and for the protection of sensitive MEMS.

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