![]() Each PhC was considered to have the micropillars as the scatterers and air, water, or epoxy as the host. 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 \(^2\). 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). In this work, we demonstrated two methods of fabricating metallic PhCs from stainless steel SS304 and identified their bandgaps. 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. 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. ![]()
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