Slow waves in locally resonant metamaterials line defect waveguides

Abstract Many efforts have been devoted to wave slowing, as it is essential, for instance, in analog signal computing and is one prerequisite for increased wave/matter interactions. Despite the interest of many communities, researches have mostly been conducted in optics, where wavelength-scaled str...

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Autores principales:	Nadège Kaina, Alexandre Causier, Yoan Bourlier, Mathias Fink, Thomas Berthelot, Geoffroy Lerosey
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/6960e2dd7d08491b8cf2abb2fef4695a
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spelling	oai:doaj.org-article:6960e2dd7d08491b8cf2abb2fef4695a2021-12-02T15:05:27ZSlow waves in locally resonant metamaterials line defect waveguides10.1038/s41598-017-15403-82045-2322https://doaj.org/article/6960e2dd7d08491b8cf2abb2fef4695a2017-11-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-15403-8https://doaj.org/toc/2045-2322Abstract Many efforts have been devoted to wave slowing, as it is essential, for instance, in analog signal computing and is one prerequisite for increased wave/matter interactions. Despite the interest of many communities, researches have mostly been conducted in optics, where wavelength-scaled structured composite media are promising candidates for compact slow light components. Yet their structural scale prevents them from being transposed to lower frequencies. Here, we propose to overcome this limitation using the deep sub-wavelength scale of locally resonant metamaterials. We experimentally show, in the microwave regime, that introducing coupled resonant defects in such metamaterials creates sub-wavelength waveguides in which wave propagation exhibit reduced group velocities. We qualitatively explain the mechanism underlying this slow wave propagation and demonstrate how it can be used to tune the velocity, achieving group indices as high as 227. We conclude by highlighting the three beneficial consequences of our line defect slow wave waveguides: (1) the sub-wavelength scale making it a compact platform for low frequencies (2) the large group indices that together with the extreme field confinement enables efficient wave/matter interactions and (3) the fact that, contrarily to other approaches, slow wave propagation does not occur at the expense of drastic bandwidth reductions.Nadège KainaAlexandre CausierYoan BourlierMathias FinkThomas BerthelotGeoffroy LeroseyNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-11 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Nadège Kaina Alexandre Causier Yoan Bourlier Mathias Fink Thomas Berthelot Geoffroy Lerosey Slow waves in locally resonant metamaterials line defect waveguides
description	Abstract Many efforts have been devoted to wave slowing, as it is essential, for instance, in analog signal computing and is one prerequisite for increased wave/matter interactions. Despite the interest of many communities, researches have mostly been conducted in optics, where wavelength-scaled structured composite media are promising candidates for compact slow light components. Yet their structural scale prevents them from being transposed to lower frequencies. Here, we propose to overcome this limitation using the deep sub-wavelength scale of locally resonant metamaterials. We experimentally show, in the microwave regime, that introducing coupled resonant defects in such metamaterials creates sub-wavelength waveguides in which wave propagation exhibit reduced group velocities. We qualitatively explain the mechanism underlying this slow wave propagation and demonstrate how it can be used to tune the velocity, achieving group indices as high as 227. We conclude by highlighting the three beneficial consequences of our line defect slow wave waveguides: (1) the sub-wavelength scale making it a compact platform for low frequencies (2) the large group indices that together with the extreme field confinement enables efficient wave/matter interactions and (3) the fact that, contrarily to other approaches, slow wave propagation does not occur at the expense of drastic bandwidth reductions.
format	article
author	Nadège Kaina Alexandre Causier Yoan Bourlier Mathias Fink Thomas Berthelot Geoffroy Lerosey
author_facet	Nadège Kaina Alexandre Causier Yoan Bourlier Mathias Fink Thomas Berthelot Geoffroy Lerosey
author_sort	Nadège Kaina
title	Slow waves in locally resonant metamaterials line defect waveguides
title_short	Slow waves in locally resonant metamaterials line defect waveguides
title_full	Slow waves in locally resonant metamaterials line defect waveguides
title_fullStr	Slow waves in locally resonant metamaterials line defect waveguides
title_full_unstemmed	Slow waves in locally resonant metamaterials line defect waveguides
title_sort	slow waves in locally resonant metamaterials line defect waveguides
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/6960e2dd7d08491b8cf2abb2fef4695a
work_keys_str_mv	AT nadegekaina slowwavesinlocallyresonantmetamaterialslinedefectwaveguides AT alexandrecausier slowwavesinlocallyresonantmetamaterialslinedefectwaveguides AT yoanbourlier slowwavesinlocallyresonantmetamaterialslinedefectwaveguides AT mathiasfink slowwavesinlocallyresonantmetamaterialslinedefectwaveguides AT thomasberthelot slowwavesinlocallyresonantmetamaterialslinedefectwaveguides AT geoffroylerosey slowwavesinlocallyresonantmetamaterialslinedefectwaveguides
_version_	1718388835035906048

Slow waves in locally resonant metamaterials line defect waveguides

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