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Reversal of transmission and reflection based on acoustic metagratings with integer parity design

Phase gradient metagratings (PGMs) have provided unprecedented opportunities for wavefront manipulation. However, this approach suffers from fundamental limits on conversion efficiency; in some cases, higher order diffraction caused by the periodicity can be observed distinctly, while the working me...

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Autores principales: Fu, Yangyang, Shen, Chen, Cao, Yanyan, Gao, Lei, Chen, Huanyang, Chan, C. T., Cummer, Steven A., Xu, Yadong
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6534607/
https://www.ncbi.nlm.nih.gov/pubmed/31127119
http://dx.doi.org/10.1038/s41467-019-10377-9
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author Fu, Yangyang
Shen, Chen
Cao, Yanyan
Gao, Lei
Chen, Huanyang
Chan, C. T.
Cummer, Steven A.
Xu, Yadong
author_facet Fu, Yangyang
Shen, Chen
Cao, Yanyan
Gao, Lei
Chen, Huanyang
Chan, C. T.
Cummer, Steven A.
Xu, Yadong
author_sort Fu, Yangyang
collection PubMed
description Phase gradient metagratings (PGMs) have provided unprecedented opportunities for wavefront manipulation. However, this approach suffers from fundamental limits on conversion efficiency; in some cases, higher order diffraction caused by the periodicity can be observed distinctly, while the working mechanism still is not fully understood, especially in refractive-type metagratings. Here we show, analytically and experimentally, a refractive-type metagrating which can enable anomalous reflection and refraction with almost unity efficiency over a wide incident range. A simple physical picture is presented to reveal the underlying diffraction mechanism. Interestingly, it is found that the anomalous transmission and reflection through higher order diffraction can be completely reversed by changing the integer parity of the PGM design, and such phenomenon is very robust. Two refractive acoustic metagratings are designed and fabricated based on this principle and the experimental results verify the theory.
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spelling pubmed-65346072019-05-28 Reversal of transmission and reflection based on acoustic metagratings with integer parity design Fu, Yangyang Shen, Chen Cao, Yanyan Gao, Lei Chen, Huanyang Chan, C. T. Cummer, Steven A. Xu, Yadong Nat Commun Article Phase gradient metagratings (PGMs) have provided unprecedented opportunities for wavefront manipulation. However, this approach suffers from fundamental limits on conversion efficiency; in some cases, higher order diffraction caused by the periodicity can be observed distinctly, while the working mechanism still is not fully understood, especially in refractive-type metagratings. Here we show, analytically and experimentally, a refractive-type metagrating which can enable anomalous reflection and refraction with almost unity efficiency over a wide incident range. A simple physical picture is presented to reveal the underlying diffraction mechanism. Interestingly, it is found that the anomalous transmission and reflection through higher order diffraction can be completely reversed by changing the integer parity of the PGM design, and such phenomenon is very robust. Two refractive acoustic metagratings are designed and fabricated based on this principle and the experimental results verify the theory. Nature Publishing Group UK 2019-05-24 /pmc/articles/PMC6534607/ /pubmed/31127119 http://dx.doi.org/10.1038/s41467-019-10377-9 Text en © The Author(s) 2019 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Fu, Yangyang
Shen, Chen
Cao, Yanyan
Gao, Lei
Chen, Huanyang
Chan, C. T.
Cummer, Steven A.
Xu, Yadong
Reversal of transmission and reflection based on acoustic metagratings with integer parity design
title Reversal of transmission and reflection based on acoustic metagratings with integer parity design
title_full Reversal of transmission and reflection based on acoustic metagratings with integer parity design
title_fullStr Reversal of transmission and reflection based on acoustic metagratings with integer parity design
title_full_unstemmed Reversal of transmission and reflection based on acoustic metagratings with integer parity design
title_short Reversal of transmission and reflection based on acoustic metagratings with integer parity design
title_sort reversal of transmission and reflection based on acoustic metagratings with integer parity design
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6534607/
https://www.ncbi.nlm.nih.gov/pubmed/31127119
http://dx.doi.org/10.1038/s41467-019-10377-9
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