High-Quality Graphene-Based Tunable Absorber Based on Double-Side Coupled-Cavity Effect

Graphene-based devices have important applications attributed to their superior performance and flexible tunability in practice. In this paper, a new kind of absorber with monolayer graphene sandwiched between two layers of dielectric rings is proposed. Two peaks with almost complete absorption are...

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Autores principales:	Qiong Wang, Zhengbiao Ouyang, Mi Lin, Yaoxian Zheng
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	graphene-based device tunable absorber coupled-cavity system finite difference time domain Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/009e5ac383754b39920dd7cbaccc44f6
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id	oai:doaj.org-article:009e5ac383754b39920dd7cbaccc44f6
record_format	dspace
spelling	oai:doaj.org-article:009e5ac383754b39920dd7cbaccc44f62021-11-25T18:30:06ZHigh-Quality Graphene-Based Tunable Absorber Based on Double-Side Coupled-Cavity Effect10.3390/nano111128242079-4991https://doaj.org/article/009e5ac383754b39920dd7cbaccc44f62021-10-01T00:00:00Zhttps://www.mdpi.com/2079-4991/11/11/2824https://doaj.org/toc/2079-4991Graphene-based devices have important applications attributed to their superior performance and flexible tunability in practice. In this paper, a new kind of absorber with monolayer graphene sandwiched between two layers of dielectric rings is proposed. Two peaks with almost complete absorption are realized. The mechanism is that the double-layer dielectric rings added to both sides of the graphene layer are equivalent to resonators, whose double-side coupled-cavity effect can make the incident electromagnetic wave highly localized in the upper and lower surfaces of graphene layer simultaneously, leading to significant enhancement in the absorption of graphene. Furthermore, the influence of geometrical parameters on absorption performance is investigated in detail. Also, the device can be actively manipulated after fabrication through varying the chemical potential of graphene. As a result, the frequency shifts of the two absorption peaks can reach as large as 2.82 THz/eV and 3.83 THz/eV, respectively. Such a device could be used as tunable absorbers and other functional devices, such as multichannel filters, chemical/biochemical modulators and sensors.Qiong WangZhengbiao OuyangMi LinYaoxian ZhengMDPI AGarticlegraphene-based devicetunable absorbercoupled-cavity systemfinite difference time domainChemistryQD1-999ENNanomaterials, Vol 11, Iss 2824, p 2824 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	graphene-based device tunable absorber coupled-cavity system finite difference time domain Chemistry QD1-999
spellingShingle	graphene-based device tunable absorber coupled-cavity system finite difference time domain Chemistry QD1-999 Qiong Wang Zhengbiao Ouyang Mi Lin Yaoxian Zheng High-Quality Graphene-Based Tunable Absorber Based on Double-Side Coupled-Cavity Effect
description	Graphene-based devices have important applications attributed to their superior performance and flexible tunability in practice. In this paper, a new kind of absorber with monolayer graphene sandwiched between two layers of dielectric rings is proposed. Two peaks with almost complete absorption are realized. The mechanism is that the double-layer dielectric rings added to both sides of the graphene layer are equivalent to resonators, whose double-side coupled-cavity effect can make the incident electromagnetic wave highly localized in the upper and lower surfaces of graphene layer simultaneously, leading to significant enhancement in the absorption of graphene. Furthermore, the influence of geometrical parameters on absorption performance is investigated in detail. Also, the device can be actively manipulated after fabrication through varying the chemical potential of graphene. As a result, the frequency shifts of the two absorption peaks can reach as large as 2.82 THz/eV and 3.83 THz/eV, respectively. Such a device could be used as tunable absorbers and other functional devices, such as multichannel filters, chemical/biochemical modulators and sensors.
format	article
author	Qiong Wang Zhengbiao Ouyang Mi Lin Yaoxian Zheng
author_facet	Qiong Wang Zhengbiao Ouyang Mi Lin Yaoxian Zheng
author_sort	Qiong Wang
title	High-Quality Graphene-Based Tunable Absorber Based on Double-Side Coupled-Cavity Effect
title_short	High-Quality Graphene-Based Tunable Absorber Based on Double-Side Coupled-Cavity Effect
title_full	High-Quality Graphene-Based Tunable Absorber Based on Double-Side Coupled-Cavity Effect
title_fullStr	High-Quality Graphene-Based Tunable Absorber Based on Double-Side Coupled-Cavity Effect
title_full_unstemmed	High-Quality Graphene-Based Tunable Absorber Based on Double-Side Coupled-Cavity Effect
title_sort	high-quality graphene-based tunable absorber based on double-side coupled-cavity effect
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/009e5ac383754b39920dd7cbaccc44f6
work_keys_str_mv	AT qiongwang highqualitygraphenebasedtunableabsorberbasedondoublesidecoupledcavityeffect AT zhengbiaoouyang highqualitygraphenebasedtunableabsorberbasedondoublesidecoupledcavityeffect AT milin highqualitygraphenebasedtunableabsorberbasedondoublesidecoupledcavityeffect AT yaoxianzheng highqualitygraphenebasedtunableabsorberbasedondoublesidecoupledcavityeffect
_version_	1718411055075426304

High-Quality Graphene-Based Tunable Absorber Based on Double-Side Coupled-Cavity Effect

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