A dual-tunable ultra-broadband terahertz absorber based on graphene and strontium titanate

An electrically and thermally dual-tunable broadband terahertz absorber based on graphene and strontium titanate is designed and analyzed. The results show that by lifting the Fermi energy of graphene, absorption is significantly enhanced, particularly at higher frequencies, resulting in a broader a...

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Autores principales:	Jiali Wu, Xin Yan, Xueguang Yuan, Yangan Zhang, Xia Zhang
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Physics QC1-999
Acceso en línea:	https://doaj.org/article/c093f7a8bde346609a7a8a0c5f52a637
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spelling	oai:doaj.org-article:c093f7a8bde346609a7a8a0c5f52a6372021-11-26T04:28:15ZA dual-tunable ultra-broadband terahertz absorber based on graphene and strontium titanate2211-379710.1016/j.rinp.2021.105039https://doaj.org/article/c093f7a8bde346609a7a8a0c5f52a6372021-12-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2211379721010305https://doaj.org/toc/2211-3797An electrically and thermally dual-tunable broadband terahertz absorber based on graphene and strontium titanate is designed and analyzed. The results show that by lifting the Fermi energy of graphene, absorption is significantly enhanced, particularly at higher frequencies, resulting in a broader absorption bandwidth. As the temperature of strontium titanate rises, the center absorption frequency shifts to the higher frequency and the bandwidth increases. At a Fermi energy of 1 eV and a temperature of 400 K, the device exhibits an ultra-broad bandwidth of 3.36 THz and remarkable peak absorption exceeding 99%. Moreover, the absorber is insensitive to incident angles, maintaining a stable broad-bandwidth beyond 3.3 THz within a large incident angle of 55° and 50° for TE and TM polarizations, respectively. The physical mechanisms are elucidated by impedance matching theory and electric field analyses. The structure shows great potential in tunable broadband terahertz absorbers and related applications.Jiali WuXin YanXueguang YuanYangan ZhangXia ZhangElsevierarticlePhysicsQC1-999ENResults in Physics, Vol 31, Iss , Pp 105039- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999
spellingShingle	Physics QC1-999 Jiali Wu Xin Yan Xueguang Yuan Yangan Zhang Xia Zhang A dual-tunable ultra-broadband terahertz absorber based on graphene and strontium titanate
description	An electrically and thermally dual-tunable broadband terahertz absorber based on graphene and strontium titanate is designed and analyzed. The results show that by lifting the Fermi energy of graphene, absorption is significantly enhanced, particularly at higher frequencies, resulting in a broader absorption bandwidth. As the temperature of strontium titanate rises, the center absorption frequency shifts to the higher frequency and the bandwidth increases. At a Fermi energy of 1 eV and a temperature of 400 K, the device exhibits an ultra-broad bandwidth of 3.36 THz and remarkable peak absorption exceeding 99%. Moreover, the absorber is insensitive to incident angles, maintaining a stable broad-bandwidth beyond 3.3 THz within a large incident angle of 55° and 50° for TE and TM polarizations, respectively. The physical mechanisms are elucidated by impedance matching theory and electric field analyses. The structure shows great potential in tunable broadband terahertz absorbers and related applications.
format	article
author	Jiali Wu Xin Yan Xueguang Yuan Yangan Zhang Xia Zhang
author_facet	Jiali Wu Xin Yan Xueguang Yuan Yangan Zhang Xia Zhang
author_sort	Jiali Wu
title	A dual-tunable ultra-broadband terahertz absorber based on graphene and strontium titanate
title_short	A dual-tunable ultra-broadband terahertz absorber based on graphene and strontium titanate
title_full	A dual-tunable ultra-broadband terahertz absorber based on graphene and strontium titanate
title_fullStr	A dual-tunable ultra-broadband terahertz absorber based on graphene and strontium titanate
title_full_unstemmed	A dual-tunable ultra-broadband terahertz absorber based on graphene and strontium titanate
title_sort	dual-tunable ultra-broadband terahertz absorber based on graphene and strontium titanate
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/c093f7a8bde346609a7a8a0c5f52a637
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A dual-tunable ultra-broadband terahertz absorber based on graphene and strontium titanate

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