Abstract
Metallic phononic crystals (PhCs) with characteristic length in micrometers can have bandgaps in the MHz regime and are suitable as bulk and surface acoustic wave devices. Fabrication of such PhCs either in batches or large scale using advanced machining techniques based on lasers, electron beams, or ion beams is too slow and expensive. In this work, we demonstrated two methods of fabricating metallic PhCs from stainless steel SS304 and identified their bandgaps. Two PhCs were fabricated using electrochemical anodic dissolution using wire-electrochemical micromachining (wire-ECMM) and three PhCs by melting and vaporization of the substrate using wire-electric discharge machining (wire-EDMM). Using these methods, a square array of micropillars of square cross-section were machined over surfaces of SS304 substrate with a cross-sectional area of 1 cm\(^2\). Each PhC was considered to have the micropillars as the scatterers and air, water, or epoxy as the host. Dispersion relations and transmittance were evaluated using the finite element method. Both types of simulation results revealed the presence of partial and complete bandgaps for the different PhCs in the frequency range of 0.1\(-\)3.5 MHz. As texturing the surface alters the lyophilic or lyophobic nature of the surface, this work paves the way to explore the development of multifunctional metamaterials.
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Acknowledgements
CC is thankful for funds from SERB Early Career Research Award ECRA/2018/002341 and the Initiation Grant from IIT Kanpur IITK/ME/2017445.
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Sharma, V., Chandraprakash, C. Fabrication and bandgaps of microscale metallic phononic crystals. Int J Adv Eng Sci Appl Math 15, 159–166 (2023). https://doi.org/10.1007/s12572-023-00340-9
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DOI: https://doi.org/10.1007/s12572-023-00340-9