Tuneable strong optical absorption in a graphene-insulator-metal hybrid plasmonic device

Abstract An optical device configuration allowing efficient electrical tuning of near total optical absorption in monolayer graphene is reported. This is achieved by combining a two-dimensional gold coated diffraction grating with a transparent spacer and a suspended graphene layer to form a doubly...

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Autores principales:	N. Matthaiakakis, Xingzhao Yan, H. Mizuta, M. D. B. Charlton
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/f5cfbbe3dc37454abebd3d2d19fe8ab0
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spelling	oai:doaj.org-article:f5cfbbe3dc37454abebd3d2d19fe8ab02021-12-02T11:53:01ZTuneable strong optical absorption in a graphene-insulator-metal hybrid plasmonic device10.1038/s41598-017-07254-02045-2322https://doaj.org/article/f5cfbbe3dc37454abebd3d2d19fe8ab02017-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-07254-0https://doaj.org/toc/2045-2322Abstract An optical device configuration allowing efficient electrical tuning of near total optical absorption in monolayer graphene is reported. This is achieved by combining a two-dimensional gold coated diffraction grating with a transparent spacer and a suspended graphene layer to form a doubly resonant plasmonic structure. Electrical tuneability is achieved with the inclusion of an ionic gel layer which plays the role of the gate dielectric. The underlying grating comprises a 2-dimensional array of inverted pyramids with a triple layer coating consisting of a reflective gold layer and two transparent dielectric spacers, also forming a vertical micro-cavity known as a Salisbury screen. Resonant coupling of plasmons between the gold grating and graphene result in strong enhancement of plasmon excitations in the atomic monolayer. Plasmon excitations can be dynamically switched off by lowering the chemical potential of graphene. Very high absorption values for an atomic monolayer and large tuning range, extremely large electrostatically induced changes in absorption over very small shifts in chemical potential are possible thus allowing for very sharp transitions in the optical behavior of the device. Overall this leads to the possibility of making electrically tunable plasmonic switches and optical memory elements by exploiting slow modes.N. MatthaiakakisXingzhao YanH. MizutaM. D. B. CharltonNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-10 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q N. Matthaiakakis Xingzhao Yan H. Mizuta M. D. B. Charlton Tuneable strong optical absorption in a graphene-insulator-metal hybrid plasmonic device
description	Abstract An optical device configuration allowing efficient electrical tuning of near total optical absorption in monolayer graphene is reported. This is achieved by combining a two-dimensional gold coated diffraction grating with a transparent spacer and a suspended graphene layer to form a doubly resonant plasmonic structure. Electrical tuneability is achieved with the inclusion of an ionic gel layer which plays the role of the gate dielectric. The underlying grating comprises a 2-dimensional array of inverted pyramids with a triple layer coating consisting of a reflective gold layer and two transparent dielectric spacers, also forming a vertical micro-cavity known as a Salisbury screen. Resonant coupling of plasmons between the gold grating and graphene result in strong enhancement of plasmon excitations in the atomic monolayer. Plasmon excitations can be dynamically switched off by lowering the chemical potential of graphene. Very high absorption values for an atomic monolayer and large tuning range, extremely large electrostatically induced changes in absorption over very small shifts in chemical potential are possible thus allowing for very sharp transitions in the optical behavior of the device. Overall this leads to the possibility of making electrically tunable plasmonic switches and optical memory elements by exploiting slow modes.
format	article
author	N. Matthaiakakis Xingzhao Yan H. Mizuta M. D. B. Charlton
author_facet	N. Matthaiakakis Xingzhao Yan H. Mizuta M. D. B. Charlton
author_sort	N. Matthaiakakis
title	Tuneable strong optical absorption in a graphene-insulator-metal hybrid plasmonic device
title_short	Tuneable strong optical absorption in a graphene-insulator-metal hybrid plasmonic device
title_full	Tuneable strong optical absorption in a graphene-insulator-metal hybrid plasmonic device
title_fullStr	Tuneable strong optical absorption in a graphene-insulator-metal hybrid plasmonic device
title_full_unstemmed	Tuneable strong optical absorption in a graphene-insulator-metal hybrid plasmonic device
title_sort	tuneable strong optical absorption in a graphene-insulator-metal hybrid plasmonic device
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/f5cfbbe3dc37454abebd3d2d19fe8ab0
work_keys_str_mv	AT nmatthaiakakis tuneablestrongopticalabsorptioninagrapheneinsulatormetalhybridplasmonicdevice AT xingzhaoyan tuneablestrongopticalabsorptioninagrapheneinsulatormetalhybridplasmonicdevice AT hmizuta tuneablestrongopticalabsorptioninagrapheneinsulatormetalhybridplasmonicdevice AT mdbcharlton tuneablestrongopticalabsorptioninagrapheneinsulatormetalhybridplasmonicdevice
_version_	1718394961744887808

Tuneable strong optical absorption in a graphene-insulator-metal hybrid plasmonic device

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