Tunable absorber embedded with GST mediums and trilayer graphene strip microheaters

Abstract Investigation was made of the optical response of metal-dielectric stacks-based cavity structures embedded with graphene microheaters for the purpose of perfect absorption. The absorber configuration exploits the Ge2Sb2Te5 (GST) phase changing medium, and the effects of different parametric...

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Autores principales:	M. Pourmand, P. K. Choudhury, Mohd Ambri Mohamed
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/63a6902cb27a4fc8b1a3a37acd7f5bd1
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spelling	oai:doaj.org-article:63a6902cb27a4fc8b1a3a37acd7f5bd12021-12-02T14:11:30ZTunable absorber embedded with GST mediums and trilayer graphene strip microheaters10.1038/s41598-021-83304-y2045-2322https://doaj.org/article/63a6902cb27a4fc8b1a3a37acd7f5bd12021-02-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-83304-yhttps://doaj.org/toc/2045-2322Abstract Investigation was made of the optical response of metal-dielectric stacks-based cavity structures embedded with graphene microheaters for the purpose of perfect absorption. The absorber configuration exploits the Ge2Sb2Te5 (GST) phase changing medium, and the effects of different parametric and operational conditions on the absorption spectra were explored. The refractive indices of GST layers can be manipulated by the external electrical pulses applied to microheaters. The amplitude and duration of electrical pulses define the crystallinity ratio of the used GST mediums. The results revealed achieving perfect absorption (> 99%) in the visible and infrared (IR) regimes of the electromagnetic spectrum upon incorporating two thin GST layers of different thicknesses (in the stack) in the amorphous state. The proposed configuration showed the capability of introducing independent transition state (amorphous and/or crystalline) for each GST layer—the visible regime could be extended to the IR regime, and the perfect absorption peak in the IR regime could be broadened and red-shifted. It is expected that the structure would find potential applications in active photonic devices, infrared imaging, detectors and tunable absorbers.M. PourmandP. K. ChoudhuryMohd Ambri MohamedNature 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 M. Pourmand P. K. Choudhury Mohd Ambri Mohamed Tunable absorber embedded with GST mediums and trilayer graphene strip microheaters
description	Abstract Investigation was made of the optical response of metal-dielectric stacks-based cavity structures embedded with graphene microheaters for the purpose of perfect absorption. The absorber configuration exploits the Ge2Sb2Te5 (GST) phase changing medium, and the effects of different parametric and operational conditions on the absorption spectra were explored. The refractive indices of GST layers can be manipulated by the external electrical pulses applied to microheaters. The amplitude and duration of electrical pulses define the crystallinity ratio of the used GST mediums. The results revealed achieving perfect absorption (> 99%) in the visible and infrared (IR) regimes of the electromagnetic spectrum upon incorporating two thin GST layers of different thicknesses (in the stack) in the amorphous state. The proposed configuration showed the capability of introducing independent transition state (amorphous and/or crystalline) for each GST layer—the visible regime could be extended to the IR regime, and the perfect absorption peak in the IR regime could be broadened and red-shifted. It is expected that the structure would find potential applications in active photonic devices, infrared imaging, detectors and tunable absorbers.
format	article
author	M. Pourmand P. K. Choudhury Mohd Ambri Mohamed
author_facet	M. Pourmand P. K. Choudhury Mohd Ambri Mohamed
author_sort	M. Pourmand
title	Tunable absorber embedded with GST mediums and trilayer graphene strip microheaters
title_short	Tunable absorber embedded with GST mediums and trilayer graphene strip microheaters
title_full	Tunable absorber embedded with GST mediums and trilayer graphene strip microheaters
title_fullStr	Tunable absorber embedded with GST mediums and trilayer graphene strip microheaters
title_full_unstemmed	Tunable absorber embedded with GST mediums and trilayer graphene strip microheaters
title_sort	tunable absorber embedded with gst mediums and trilayer graphene strip microheaters
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/63a6902cb27a4fc8b1a3a37acd7f5bd1
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Tunable absorber embedded with GST mediums and trilayer graphene strip microheaters

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