Broadband All-angle Negative Refraction by Optimized Phononic Crystals

Broadband All-angle Negative Refraction by Optimized Phononic Crystals

Abstract All-angle negative refraction (AANR) of phononic crystals and its frequency range are dependent on mechanical properties of constituent materials and their spatial distribution. So far, it is impossible to achieve the maximum operation frequency range of AANR theoretically. In this paper, w...

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Autores principales: Yang Fan Li, Fei Meng, Shiwei Zhou, Ming-Hui Lu, Xiaodong Huang
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Lenguaje:EN
Publicado: Nature Portfolio 2017
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Acceso en línea:https://doaj.org/article/844aaf03dc294fbdacbcdaf207ccbd38
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spelling oai:doaj.org-article:844aaf03dc294fbdacbcdaf207ccbd382021-12-02T11:51:03ZBroadband All-angle Negative Refraction by Optimized Phononic Crystals10.1038/s41598-017-07914-12045-2322https://doaj.org/article/844aaf03dc294fbdacbcdaf207ccbd382017-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-07914-1https://doaj.org/toc/2045-2322Abstract All-angle negative refraction (AANR) of phononic crystals and its frequency range are dependent on mechanical properties of constituent materials and their spatial distribution. So far, it is impossible to achieve the maximum operation frequency range of AANR theoretically. In this paper, we will present a numerical approach for designing a two-dimensional phononic crystal with broadband AANR without negative index. Through analyzing the mechanism of AANR, a topology optimization problem aiming at broadband AANR is established and solved by bi-directional evolutionary structural optimization method. The optimal steel/air phononic crystal exhibits a record AANR range over 20% and its refractive properties and focusing effects are further investigated. The results demonstrate the multifunctionality of a flat phononic slab including superlensing effect near upper AANR frequencies and self-collimation at lower AANR frequencies.Yang Fan LiFei MengShiwei ZhouMing-Hui LuXiaodong HuangNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-7 (2017)
institution DOAJ
collection DOAJ
language EN
topic Medicine
R
Science
Q
spellingShingle Medicine
R
Science
Q
Yang Fan Li
Fei Meng
Shiwei Zhou
Ming-Hui Lu
Xiaodong Huang
Broadband All-angle Negative Refraction by Optimized Phononic Crystals
description Abstract All-angle negative refraction (AANR) of phononic crystals and its frequency range are dependent on mechanical properties of constituent materials and their spatial distribution. So far, it is impossible to achieve the maximum operation frequency range of AANR theoretically. In this paper, we will present a numerical approach for designing a two-dimensional phononic crystal with broadband AANR without negative index. Through analyzing the mechanism of AANR, a topology optimization problem aiming at broadband AANR is established and solved by bi-directional evolutionary structural optimization method. The optimal steel/air phononic crystal exhibits a record AANR range over 20% and its refractive properties and focusing effects are further investigated. The results demonstrate the multifunctionality of a flat phononic slab including superlensing effect near upper AANR frequencies and self-collimation at lower AANR frequencies.
format article
author Yang Fan Li
Fei Meng
Shiwei Zhou
Ming-Hui Lu
Xiaodong Huang
author_facet Yang Fan Li
Fei Meng
Shiwei Zhou
Ming-Hui Lu
Xiaodong Huang
author_sort Yang Fan Li
title Broadband All-angle Negative Refraction by Optimized Phononic Crystals
title_short Broadband All-angle Negative Refraction by Optimized Phononic Crystals
title_full Broadband All-angle Negative Refraction by Optimized Phononic Crystals
title_fullStr Broadband All-angle Negative Refraction by Optimized Phononic Crystals
title_full_unstemmed Broadband All-angle Negative Refraction by Optimized Phononic Crystals
title_sort broadband all-angle negative refraction by optimized phononic crystals
publisher Nature Portfolio
publishDate 2017
url https://doaj.org/article/844aaf03dc294fbdacbcdaf207ccbd38
work_keys_str_mv AT yangfanli broadbandallanglenegativerefractionbyoptimizedphononiccrystals
AT feimeng broadbandallanglenegativerefractionbyoptimizedphononiccrystals
AT shiweizhou broadbandallanglenegativerefractionbyoptimizedphononiccrystals
AT minghuilu broadbandallanglenegativerefractionbyoptimizedphononiccrystals
AT xiaodonghuang broadbandallanglenegativerefractionbyoptimizedphononiccrystals
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