@inproceedings{ee3fe7f4e98f4e0d9cdbaeb23dfdc945,
title = "Negative refraction in conventional and additively manufactured phononic crystals",
abstract = "Phononic crystals are acoustic metamaterials designed to manipulate sound when its wavelength is in the order of magnitude of the crystal lattice constant. Metallic phononic crystals for use in water were assembled using commercially available stainless steel rods with an average superficial roughness Ra=0.5±0.5 μm, while Laser Powder Bed Fabrication, an additive manufacturing technique, was employed to produce similar Inconel 718 structures with Ra=20±6 μm. Experiments in the 150 - 500 kHz frequency range indicated that acoustic band gaps and negative refraction were present in both cases, with similar features. This indicates that Laser Powder Bed Fabrication is a promising method for realising such phononic crystals.",
keywords = "Band Gaps, Laser Powder Bed Fabrication, Metamaterial, Negative Refraction, Phononic Crystal, Selective Laser Melting",
author = "Lorenzo Astolfi and Watson, {Richard L.} and Hutchins, {David A.} and Thomas, {Peter J.} and Meisam Askari and Clare, {Adam T.} and Luzhen Nie and Steven Freear and Stefano Laureti and Marco Ricci",
note = "Funding: UK Engineering and Physical Sciences Research Council (EPSRC), grant numbers EP/N034163/1, EP/N034201/1 and EP/N034813/1.; 2019 IEEE International Ultrasonics Symposium, IUS 2019 ; Conference date: 06-10-2019 Through 09-10-2019",
year = "2019",
month = dec,
day = "9",
doi = "10.1109/ULTSYM.2019.8926236",
language = "English",
isbn = "9781728145976",
series = "IEEE International Ultrasonics Symposium, IUS",
publisher = "IEEE",
pages = "2529--2532",
booktitle = "2019 IEEE International Ultrasonics Symposium, IUS 2019",
}