Spiral sound-diffusing metasurfaces based on holographic vortices

Abstract In this work, we show that scattered acoustic vortices generated by metasurfaces with chiral symmetry present broadband unusual properties in the far-field. These metasurfaces are designed to encode the holographic field of an acoustical vortex, resulting in structures with spiral geometry....

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Autores principales:	Noé Jiménez, Jean-Philippe Groby, Vicent Romero-García
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/0a72f812a1994ec69a9772ad3ab53098
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spelling	oai:doaj.org-article:0a72f812a1994ec69a9772ad3ab530982021-12-02T15:43:08ZSpiral sound-diffusing metasurfaces based on holographic vortices10.1038/s41598-021-89487-82045-2322https://doaj.org/article/0a72f812a1994ec69a9772ad3ab530982021-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-89487-8https://doaj.org/toc/2045-2322Abstract In this work, we show that scattered acoustic vortices generated by metasurfaces with chiral symmetry present broadband unusual properties in the far-field. These metasurfaces are designed to encode the holographic field of an acoustical vortex, resulting in structures with spiral geometry. In the near field, phase dislocations with tuned topological charge emerge when the scattered waves interference destructively along the axis of the spiral metasurface. In the far field, metasurfaces based on holographic vortices inhibit specular reflections because all scattered waves also interfere destructively in the normal direction. In addition, the scattering function in the far field is unusually uniform because the reflected waves diverge spherically from the holographic focal point. In this way, by triggering vorticity, energy can be evenly reflected in all directions except to the normal. As a consequence, the designed metasurface presents a mean correlation-scattering coefficient of 0.99 (0.98 in experiments) and a mean normalized diffusion coefficient of 0.73 (0.76 in experiments) over a 4 octave frequency band. The singular features of the resulting metasurfaces with chiral geometry allow the simultaneous generation of broadband, diffuse and non-specular scattering. These three exceptional features make spiral metasurfaces extraordinary candidates for controlling acoustic scattering and generating diffuse sound reflections in several applications and branches of wave physics as underwater acoustics, biomedical ultrasound, particle manipulation devices or room acoustics.Noé JiménezJean-Philippe GrobyVicent Romero-GarcíaNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-13 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Noé Jiménez Jean-Philippe Groby Vicent Romero-García Spiral sound-diffusing metasurfaces based on holographic vortices
description	Abstract In this work, we show that scattered acoustic vortices generated by metasurfaces with chiral symmetry present broadband unusual properties in the far-field. These metasurfaces are designed to encode the holographic field of an acoustical vortex, resulting in structures with spiral geometry. In the near field, phase dislocations with tuned topological charge emerge when the scattered waves interference destructively along the axis of the spiral metasurface. In the far field, metasurfaces based on holographic vortices inhibit specular reflections because all scattered waves also interfere destructively in the normal direction. In addition, the scattering function in the far field is unusually uniform because the reflected waves diverge spherically from the holographic focal point. In this way, by triggering vorticity, energy can be evenly reflected in all directions except to the normal. As a consequence, the designed metasurface presents a mean correlation-scattering coefficient of 0.99 (0.98 in experiments) and a mean normalized diffusion coefficient of 0.73 (0.76 in experiments) over a 4 octave frequency band. The singular features of the resulting metasurfaces with chiral geometry allow the simultaneous generation of broadband, diffuse and non-specular scattering. These three exceptional features make spiral metasurfaces extraordinary candidates for controlling acoustic scattering and generating diffuse sound reflections in several applications and branches of wave physics as underwater acoustics, biomedical ultrasound, particle manipulation devices or room acoustics.
format	article
author	Noé Jiménez Jean-Philippe Groby Vicent Romero-García
author_facet	Noé Jiménez Jean-Philippe Groby Vicent Romero-García
author_sort	Noé Jiménez
title	Spiral sound-diffusing metasurfaces based on holographic vortices
title_short	Spiral sound-diffusing metasurfaces based on holographic vortices
title_full	Spiral sound-diffusing metasurfaces based on holographic vortices
title_fullStr	Spiral sound-diffusing metasurfaces based on holographic vortices
title_full_unstemmed	Spiral sound-diffusing metasurfaces based on holographic vortices
title_sort	spiral sound-diffusing metasurfaces based on holographic vortices
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/0a72f812a1994ec69a9772ad3ab53098
work_keys_str_mv	AT noejimenez spiralsounddiffusingmetasurfacesbasedonholographicvortices AT jeanphilippegroby spiralsounddiffusingmetasurfacesbasedonholographicvortices AT vicentromerogarcia spiralsounddiffusingmetasurfacesbasedonholographicvortices
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Spiral sound-diffusing metasurfaces based on holographic vortices

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