Negative refraction in conventional and additively manufactured phononic crystals

被引：0

作者：

Astolfi, Lorenzo ^{[1
]}

Watson, Richard L. ^{[1
]}

Hutchins, David A. ^{[1
]}

Thomas, Peter J. ^{[1
]}

Askari, Meisam ^{[2
]}

Clare, Adam T. ^{[2
]}

Nie, Luzhen ^{[3
]}

Freear, Steven ^{[3
]}

Laureti, Stefano ^{[4
]}

Ricci, Marco ^{[4
]}

机构：

[1] Univ Warwick, Sch Engn, Coventry, W Midlands, England

[2] Univ Nottingham, Dept Mech Mat & Mfg Engn, Nottingham, England

[3] Univ Leeds, Sch Elect & Elect Engn, Leeds, W Yorkshire, England

[4] Univ Calabria, Dept Informat Modelling Elect & Syst Engn, Arcavacata Di Rende, Italy

来源：

2019 IEEE INTERNATIONAL ULTRASONICS SYMPOSIUM (IUS) | 2019年

基金：

英国工程与自然科学研究理事会;

关键词：

Metamaterial; Phononic Crystal; Laser Powder Bed Fabrication; Selective Laser Melting; Band Gaps; Negative Refraction;

D O I：

10.1109/ultsym.2019.8926236

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

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 R-a=0.5 +/- 0.5 mu m, while Laser Powder Bed Fabrication, an additive manufacturing technique, was employed to produce similar Inconel 718 structures with R-a=20 +/- 6 mu m. 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.

引用

页码：2529 / 2532

页数：4

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