Cargando…

Sound vortex diffraction via topological charge in phase gradient metagratings

Wave fields with orbital angular momentum (OAM) have been widely investigated in metasurfaces. By engineering acoustic metasurfaces with phase gradient elements, phase twisting is commonly used to obtain acoustic OAM. However, it has limited ability to manipulate sound vortices, and a more powerful...

Descripción completa

Detalles Bibliográficos
Autores principales: Fu, Yangyang, Shen, Chen, Zhu, Xiaohui, Li, Junfei, Liu, Youwen, Cummer, Steven A., Xu, Yadong
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Association for the Advancement of Science 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7852395/
https://www.ncbi.nlm.nih.gov/pubmed/33008907
http://dx.doi.org/10.1126/sciadv.aba9876
_version_ 1783645813513125888
author Fu, Yangyang
Shen, Chen
Zhu, Xiaohui
Li, Junfei
Liu, Youwen
Cummer, Steven A.
Xu, Yadong
author_facet Fu, Yangyang
Shen, Chen
Zhu, Xiaohui
Li, Junfei
Liu, Youwen
Cummer, Steven A.
Xu, Yadong
author_sort Fu, Yangyang
collection PubMed
description Wave fields with orbital angular momentum (OAM) have been widely investigated in metasurfaces. By engineering acoustic metasurfaces with phase gradient elements, phase twisting is commonly used to obtain acoustic OAM. However, it has limited ability to manipulate sound vortices, and a more powerful mechanism for sound vortex manipulation is strongly desired. Here, we propose the diffraction mechanism to manipulate sound vortices in a cylindrical waveguide with phase gradient metagratings (PGMs). A sound vortex diffraction law is theoretically revealed based on the generalized conservation principle of topological charge. This diffraction law can explain and predict the complicated diffraction phenomena of sound vortices, as confirmed by numerical simulations. To exemplify our findings, we designed and experimentally verified a PGM based on Helmholtz resonators that support asymmetric transmission of sound vortices. Our work provides previously unidentified opportunities for manipulating sound vortices, which can advance more versatile design for OAM-based devices.
format Online
Article
Text
id pubmed-7852395
institution National Center for Biotechnology Information
language English
publishDate 2020
publisher American Association for the Advancement of Science
record_format MEDLINE/PubMed
spelling pubmed-78523952021-02-16 Sound vortex diffraction via topological charge in phase gradient metagratings Fu, Yangyang Shen, Chen Zhu, Xiaohui Li, Junfei Liu, Youwen Cummer, Steven A. Xu, Yadong Sci Adv Research Articles Wave fields with orbital angular momentum (OAM) have been widely investigated in metasurfaces. By engineering acoustic metasurfaces with phase gradient elements, phase twisting is commonly used to obtain acoustic OAM. However, it has limited ability to manipulate sound vortices, and a more powerful mechanism for sound vortex manipulation is strongly desired. Here, we propose the diffraction mechanism to manipulate sound vortices in a cylindrical waveguide with phase gradient metagratings (PGMs). A sound vortex diffraction law is theoretically revealed based on the generalized conservation principle of topological charge. This diffraction law can explain and predict the complicated diffraction phenomena of sound vortices, as confirmed by numerical simulations. To exemplify our findings, we designed and experimentally verified a PGM based on Helmholtz resonators that support asymmetric transmission of sound vortices. Our work provides previously unidentified opportunities for manipulating sound vortices, which can advance more versatile design for OAM-based devices. American Association for the Advancement of Science 2020-10-02 /pmc/articles/PMC7852395/ /pubmed/33008907 http://dx.doi.org/10.1126/sciadv.aba9876 Text en Copyright © 2020 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC). https://creativecommons.org/licenses/by-nc/4.0/ https://creativecommons.org/licenses/by-nc/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license (https://creativecommons.org/licenses/by-nc/4.0/) , which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited.
spellingShingle Research Articles
Fu, Yangyang
Shen, Chen
Zhu, Xiaohui
Li, Junfei
Liu, Youwen
Cummer, Steven A.
Xu, Yadong
Sound vortex diffraction via topological charge in phase gradient metagratings
title Sound vortex diffraction via topological charge in phase gradient metagratings
title_full Sound vortex diffraction via topological charge in phase gradient metagratings
title_fullStr Sound vortex diffraction via topological charge in phase gradient metagratings
title_full_unstemmed Sound vortex diffraction via topological charge in phase gradient metagratings
title_short Sound vortex diffraction via topological charge in phase gradient metagratings
title_sort sound vortex diffraction via topological charge in phase gradient metagratings
topic Research Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7852395/
https://www.ncbi.nlm.nih.gov/pubmed/33008907
http://dx.doi.org/10.1126/sciadv.aba9876
work_keys_str_mv AT fuyangyang soundvortexdiffractionviatopologicalchargeinphasegradientmetagratings
AT shenchen soundvortexdiffractionviatopologicalchargeinphasegradientmetagratings
AT zhuxiaohui soundvortexdiffractionviatopologicalchargeinphasegradientmetagratings
AT lijunfei soundvortexdiffractionviatopologicalchargeinphasegradientmetagratings
AT liuyouwen soundvortexdiffractionviatopologicalchargeinphasegradientmetagratings
AT cummerstevena soundvortexdiffractionviatopologicalchargeinphasegradientmetagratings
AT xuyadong soundvortexdiffractionviatopologicalchargeinphasegradientmetagratings