Adiabatic mode transformation in width-graded nano-gratings enabling multiwavelength light localization

Abstract We delineate the four principal surface plasmon polariton coupling and interaction mechanisms in subwavelength gratings, and demonstrate their significant roles in shaping the optical response of plasmonic gratings. Within the framework of width-graded metal–insulator-metal nano-gratings, e...

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Autores principales:	Moein Shayegannia, Arthur O. Montazeri, Katelyn Dixon, Rajiv Prinja, Nastaran Kazemi-Zanjani, Nazir P. Kherani
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/85f06642271343d3bff25cb4a2169e32
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spelling	oai:doaj.org-article:85f06642271343d3bff25cb4a2169e322021-12-02T15:22:59ZAdiabatic mode transformation in width-graded nano-gratings enabling multiwavelength light localization10.1038/s41598-020-79815-92045-2322https://doaj.org/article/85f06642271343d3bff25cb4a2169e322021-01-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-79815-9https://doaj.org/toc/2045-2322Abstract We delineate the four principal surface plasmon polariton coupling and interaction mechanisms in subwavelength gratings, and demonstrate their significant roles in shaping the optical response of plasmonic gratings. Within the framework of width-graded metal–insulator-metal nano-gratings, electromagnetic field confinement and wave guiding result in multiwavelength light localization provided conditions of adiabatic mode transformation are satisfied. The field is enhanced further through fine tuning of the groove-width (w), groove-depth (L) and groove-to-groove-separation (d). By juxtaposing the resonance modes of width-graded and non-graded gratings and defining the adiabaticity condition, we demonstrate the criticality of w and d in achieving adiabatic mode transformation among the grooves. We observe that the resonant wavelength of a graded grating corresponds to the properties of a single groove when the grooves are adiabatically coupled. We show that L plays an important function in defining the span of localized wavelengths. Specifically, we show that multiwavelength resonant modes with intensity enhancement exceeding three orders of magnitude are possible with w < 30 nm and 300 nm < d < 900 nm for a range of fixed values of L. This study presents a novel paradigm of deep-subwavelength adiabatically-coupled width-graded gratings—illustrating its versatility in design, hence its viability for applications ranging from surface enhanced Raman spectroscopy to multispectral imaging.Moein ShayeganniaArthur O. MontazeriKatelyn DixonRajiv PrinjaNastaran Kazemi-ZanjaniNazir P. KheraniNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-12 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Moein Shayegannia Arthur O. Montazeri Katelyn Dixon Rajiv Prinja Nastaran Kazemi-Zanjani Nazir P. Kherani Adiabatic mode transformation in width-graded nano-gratings enabling multiwavelength light localization
description	Abstract We delineate the four principal surface plasmon polariton coupling and interaction mechanisms in subwavelength gratings, and demonstrate their significant roles in shaping the optical response of plasmonic gratings. Within the framework of width-graded metal–insulator-metal nano-gratings, electromagnetic field confinement and wave guiding result in multiwavelength light localization provided conditions of adiabatic mode transformation are satisfied. The field is enhanced further through fine tuning of the groove-width (w), groove-depth (L) and groove-to-groove-separation (d). By juxtaposing the resonance modes of width-graded and non-graded gratings and defining the adiabaticity condition, we demonstrate the criticality of w and d in achieving adiabatic mode transformation among the grooves. We observe that the resonant wavelength of a graded grating corresponds to the properties of a single groove when the grooves are adiabatically coupled. We show that L plays an important function in defining the span of localized wavelengths. Specifically, we show that multiwavelength resonant modes with intensity enhancement exceeding three orders of magnitude are possible with w < 30 nm and 300 nm < d < 900 nm for a range of fixed values of L. This study presents a novel paradigm of deep-subwavelength adiabatically-coupled width-graded gratings—illustrating its versatility in design, hence its viability for applications ranging from surface enhanced Raman spectroscopy to multispectral imaging.
format	article
author	Moein Shayegannia Arthur O. Montazeri Katelyn Dixon Rajiv Prinja Nastaran Kazemi-Zanjani Nazir P. Kherani
author_facet	Moein Shayegannia Arthur O. Montazeri Katelyn Dixon Rajiv Prinja Nastaran Kazemi-Zanjani Nazir P. Kherani
author_sort	Moein Shayegannia
title	Adiabatic mode transformation in width-graded nano-gratings enabling multiwavelength light localization
title_short	Adiabatic mode transformation in width-graded nano-gratings enabling multiwavelength light localization
title_full	Adiabatic mode transformation in width-graded nano-gratings enabling multiwavelength light localization
title_fullStr	Adiabatic mode transformation in width-graded nano-gratings enabling multiwavelength light localization
title_full_unstemmed	Adiabatic mode transformation in width-graded nano-gratings enabling multiwavelength light localization
title_sort	adiabatic mode transformation in width-graded nano-gratings enabling multiwavelength light localization
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/85f06642271343d3bff25cb4a2169e32
work_keys_str_mv	AT moeinshayegannia adiabaticmodetransformationinwidthgradednanogratingsenablingmultiwavelengthlightlocalization AT arthuromontazeri adiabaticmodetransformationinwidthgradednanogratingsenablingmultiwavelengthlightlocalization AT katelyndixon adiabaticmodetransformationinwidthgradednanogratingsenablingmultiwavelengthlightlocalization AT rajivprinja adiabaticmodetransformationinwidthgradednanogratingsenablingmultiwavelengthlightlocalization AT nastarankazemizanjani adiabaticmodetransformationinwidthgradednanogratingsenablingmultiwavelengthlightlocalization AT nazirpkherani adiabaticmodetransformationinwidthgradednanogratingsenablingmultiwavelengthlightlocalization
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Adiabatic mode transformation in width-graded nano-gratings enabling multiwavelength light localization

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