A proposal of a perfect graphene absorber with enhanced design and fabrication tolerance

Abstract We propose a novel device structure for the perfect absorption of a one-sided lightwavve illumination, which consists of a high-contrast grating (HCG) and an evanescently coupled slab with an absorbing medium (graphene). The operation principle and design process of the proposed structure a...

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Autores principales:	Sangjun Lee, Thang Q. Tran, Hyungjun Heo, Myunghwan Kim, Sangin Kim
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/da22f6fab29943419ac8d32bf91a42bc
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spelling	oai:doaj.org-article:da22f6fab29943419ac8d32bf91a42bc2021-12-02T12:30:27ZA proposal of a perfect graphene absorber with enhanced design and fabrication tolerance10.1038/s41598-017-04995-w2045-2322https://doaj.org/article/da22f6fab29943419ac8d32bf91a42bc2017-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-04995-whttps://doaj.org/toc/2045-2322Abstract We propose a novel device structure for the perfect absorption of a one-sided lightwavve illumination, which consists of a high-contrast grating (HCG) and an evanescently coupled slab with an absorbing medium (graphene). The operation principle and design process of the proposed structure are analyzed using the coupled mode theory (CMT), which is confirmed by the rigorous coupled wave analysis (RCWA). According to the CMT analysis, in the design of the proposed perfect absorber, the HCG, functioning as a broadband reflector, and the lossy slab structure can be optimized separately. In addition, we have more design parameters than conditions to satisfy; that is, we have more than enough degrees of freedom in the device design. This significantly relieves the complexity of the perfect absorber design. Moreover, in the proposed perfect absorber, most of the incident wave is confined in the slab region with strong field enhancement, so that the absorption performance is very tolerant to the variation of the design parameters near the optimal values for the perfect absorption. It has been demonstrated numerically that absorption spectrum tuning over a wider wavelength range of ~300 nm is possible, keeping significantly high maximum absorption (>95%). It is also shown that the proposed perfect absorber outperforms the previously proposed scheme in all aspects.Sangjun LeeThang Q. TranHyungjun HeoMyunghwan KimSangin KimNature 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 Sangjun Lee Thang Q. Tran Hyungjun Heo Myunghwan Kim Sangin Kim A proposal of a perfect graphene absorber with enhanced design and fabrication tolerance
description	Abstract We propose a novel device structure for the perfect absorption of a one-sided lightwavve illumination, which consists of a high-contrast grating (HCG) and an evanescently coupled slab with an absorbing medium (graphene). The operation principle and design process of the proposed structure are analyzed using the coupled mode theory (CMT), which is confirmed by the rigorous coupled wave analysis (RCWA). According to the CMT analysis, in the design of the proposed perfect absorber, the HCG, functioning as a broadband reflector, and the lossy slab structure can be optimized separately. In addition, we have more design parameters than conditions to satisfy; that is, we have more than enough degrees of freedom in the device design. This significantly relieves the complexity of the perfect absorber design. Moreover, in the proposed perfect absorber, most of the incident wave is confined in the slab region with strong field enhancement, so that the absorption performance is very tolerant to the variation of the design parameters near the optimal values for the perfect absorption. It has been demonstrated numerically that absorption spectrum tuning over a wider wavelength range of ~300 nm is possible, keeping significantly high maximum absorption (>95%). It is also shown that the proposed perfect absorber outperforms the previously proposed scheme in all aspects.
format	article
author	Sangjun Lee Thang Q. Tran Hyungjun Heo Myunghwan Kim Sangin Kim
author_facet	Sangjun Lee Thang Q. Tran Hyungjun Heo Myunghwan Kim Sangin Kim
author_sort	Sangjun Lee
title	A proposal of a perfect graphene absorber with enhanced design and fabrication tolerance
title_short	A proposal of a perfect graphene absorber with enhanced design and fabrication tolerance
title_full	A proposal of a perfect graphene absorber with enhanced design and fabrication tolerance
title_fullStr	A proposal of a perfect graphene absorber with enhanced design and fabrication tolerance
title_full_unstemmed	A proposal of a perfect graphene absorber with enhanced design and fabrication tolerance
title_sort	proposal of a perfect graphene absorber with enhanced design and fabrication tolerance
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/da22f6fab29943419ac8d32bf91a42bc
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A proposal of a perfect graphene absorber with enhanced design and fabrication tolerance

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