Graphene perfect absorber with loss adaptive Q-factor control function enabled by quasi-bound states in the continuum

Abstract Numerous device structures have been proposed for perfect absorption in monolayer graphene under single-sided illumination, all of which requires the critical coupling condition, i.e., the balance between the loss of graphene and the leakage rate of the device. However, due to the difficult...

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Autores principales:	Sangjun Lee, Joohyung Song, Sangin Kim
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/d1db1599379749c5b9caace878d3aa63
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spelling	oai:doaj.org-article:d1db1599379749c5b9caace878d3aa632021-11-28T12:19:04ZGraphene perfect absorber with loss adaptive Q-factor control function enabled by quasi-bound states in the continuum10.1038/s41598-021-02318-82045-2322https://doaj.org/article/d1db1599379749c5b9caace878d3aa632021-11-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-02318-8https://doaj.org/toc/2045-2322Abstract Numerous device structures have been proposed for perfect absorption in monolayer graphene under single-sided illumination, all of which requires the critical coupling condition, i.e., the balance between the loss of graphene and the leakage rate of the device. However, due to the difficulty of the precise control of the quality of synthesized graphene and unwanted doping in graphene transferred to the substrate, the loss of graphene is rather unpredictable, so that the perfect absorption is quite difficult to achieve in practice. To solve this problem, we designed a novel perfect absorber structure with a loss adaptive leakage rate control function enabled by the quasi-bound states in the continuum (BIC) and numerically demonstrated its performance. Our designed device is based on a slab-waveguide grating supporting both the quasi-BIC and the guided-mode resonance (GMR); the quasi-BIC with an adjustable leakage rate controlled by an incident angle is responsible for absorption, while the GMR works as an internal mirror. Since the proposed device scheme can have an arbitrarily small leakage rate, it can be used to implement a perfect absorber for any kind of ultrathin absorbing media. Due to the simple structure avoiding an external reflector, the device is easy to fabricate.Sangjun LeeJoohyung SongSangin KimNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-8 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Sangjun Lee Joohyung Song Sangin Kim Graphene perfect absorber with loss adaptive Q-factor control function enabled by quasi-bound states in the continuum
description	Abstract Numerous device structures have been proposed for perfect absorption in monolayer graphene under single-sided illumination, all of which requires the critical coupling condition, i.e., the balance between the loss of graphene and the leakage rate of the device. However, due to the difficulty of the precise control of the quality of synthesized graphene and unwanted doping in graphene transferred to the substrate, the loss of graphene is rather unpredictable, so that the perfect absorption is quite difficult to achieve in practice. To solve this problem, we designed a novel perfect absorber structure with a loss adaptive leakage rate control function enabled by the quasi-bound states in the continuum (BIC) and numerically demonstrated its performance. Our designed device is based on a slab-waveguide grating supporting both the quasi-BIC and the guided-mode resonance (GMR); the quasi-BIC with an adjustable leakage rate controlled by an incident angle is responsible for absorption, while the GMR works as an internal mirror. Since the proposed device scheme can have an arbitrarily small leakage rate, it can be used to implement a perfect absorber for any kind of ultrathin absorbing media. Due to the simple structure avoiding an external reflector, the device is easy to fabricate.
format	article
author	Sangjun Lee Joohyung Song Sangin Kim
author_facet	Sangjun Lee Joohyung Song Sangin Kim
author_sort	Sangjun Lee
title	Graphene perfect absorber with loss adaptive Q-factor control function enabled by quasi-bound states in the continuum
title_short	Graphene perfect absorber with loss adaptive Q-factor control function enabled by quasi-bound states in the continuum
title_full	Graphene perfect absorber with loss adaptive Q-factor control function enabled by quasi-bound states in the continuum
title_fullStr	Graphene perfect absorber with loss adaptive Q-factor control function enabled by quasi-bound states in the continuum
title_full_unstemmed	Graphene perfect absorber with loss adaptive Q-factor control function enabled by quasi-bound states in the continuum
title_sort	graphene perfect absorber with loss adaptive q-factor control function enabled by quasi-bound states in the continuum
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/d1db1599379749c5b9caace878d3aa63
work_keys_str_mv	AT sangjunlee grapheneperfectabsorberwithlossadaptiveqfactorcontrolfunctionenabledbyquasiboundstatesinthecontinuum AT joohyungsong grapheneperfectabsorberwithlossadaptiveqfactorcontrolfunctionenabledbyquasiboundstatesinthecontinuum AT sanginkim grapheneperfectabsorberwithlossadaptiveqfactorcontrolfunctionenabledbyquasiboundstatesinthecontinuum
_version_	1718408104077426688

Graphene perfect absorber with loss adaptive Q-factor control function enabled by quasi-bound states in the continuum

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