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Crystals 2017, 7(11), 348; doi:10.3390/cryst7110348

Design and Fabrication Challenges for Millimeter-Scale Three-Dimensional Phononic Crystals

Institute for Microsensors, -actuators and -systems (IMSAS), Microsystems Center Bremen (MCB), University of Bremen, D-28359 Bremen, Germany
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Academic Editors: Abdelkrim Khelif and Sarah Benchabane
Received: 16 October 2017 / Revised: 9 November 2017 / Accepted: 11 November 2017 / Published: 15 November 2017
(This article belongs to the Special Issue Phononics)
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Abstract

While phononic crystals can be theoretically modeled with a variety of analytical and numerical methods, the practical realization and comprehensive characterization of complex designs is often challenging. This is especially important for the nearly limitless possibilities of periodic, three-dimensional structures. In this contribution, we take a look at these design and fabrication challenges of different 3D phononic elements based on recent research using additive manufacturing. Different fabrication technologies introduce specific limitations in terms of, e.g., material choices, minimum feature size, aspect ratios, or support requirements that have to be taken into account during design and theoretical modeling. We discuss advantages and disadvantages of additive technologies suitable for millimeter and sub-millimeter feature sizes. Furthermore, we present comprehensive experimental characterization of finite, simple cubic lattices in terms of wave polarization and propagation direction to demonstrate the substantial differences between complete phononic band gap and application oriented directional band gaps of selected propagation modes. View Full-Text
Keywords: phononic crystals; additive manufacturing; 3D unit cell; fabrication challenges; complete acoustic band gap; directional band gap; transmission loss phononic crystals; additive manufacturing; 3D unit cell; fabrication challenges; complete acoustic band gap; directional band gap; transmission loss
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Lucklum, F.; Vellekoop, M.J. Design and Fabrication Challenges for Millimeter-Scale Three-Dimensional Phononic Crystals. Crystals 2017, 7, 348.

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