Strong Terahertz Absorption of Monolayer Graphene Embedded into a Microcavity

Terahertz reflection behaviors of metallic-grating-dielectric-metal (MGDM) microcavity with a monolayer graphene embedded into the dielectric layer are theoretically investigated. A tunable wideband reflection dip at about the Fabry–Pérot resonant frequency of the structure is found. The reflectance...

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Main Authors:	Xuguang Guo, Lejie Xue, Zhenxing Yang, Mengjian Xu, Yiming Zhu, Dixiang Shao, Zhanglong Fu, Zhiyong Tan, Chang Wang, Juncheng Cao, Chao Zhang
Format:	Article
Language:	English
Published:	MDPI AG 2021-02-01
Series:	Nanomaterials
Subjects:	terahertz graphene microcavity absorption enhancement near field
Online Access:	https://www.mdpi.com/2079-4991/11/2/421

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spelling	doaj-2a687e3781454067b1de4aca766328172021-02-08T00:02:37ZengMDPI AGNanomaterials2079-49912021-02-011142142110.3390/nano11020421Strong Terahertz Absorption of Monolayer Graphene Embedded into a MicrocavityXuguang Guo0Lejie Xue1Zhenxing Yang2Mengjian Xu3Yiming Zhu4Dixiang Shao5Zhanglong Fu6Zhiyong Tan7Chang Wang8Juncheng Cao9Chao Zhang10Terahertz Spectrum and Imaging Technology Cooperative Innovation Center, Terahertz Technology Innovation Research Institute, Shanghai Key Lab of Modern Optical System, University of Shanghai for Science and Technology, 516 Jungong Road, Shanghai 200093, ChinaTerahertz Spectrum and Imaging Technology Cooperative Innovation Center, Terahertz Technology Innovation Research Institute, Shanghai Key Lab of Modern Optical System, University of Shanghai for Science and Technology, 516 Jungong Road, Shanghai 200093, ChinaTerahertz Spectrum and Imaging Technology Cooperative Innovation Center, Terahertz Technology Innovation Research Institute, Shanghai Key Lab of Modern Optical System, University of Shanghai for Science and Technology, 516 Jungong Road, Shanghai 200093, ChinaTerahertz Spectrum and Imaging Technology Cooperative Innovation Center, Terahertz Technology Innovation Research Institute, Shanghai Key Lab of Modern Optical System, University of Shanghai for Science and Technology, 516 Jungong Road, Shanghai 200093, ChinaTerahertz Spectrum and Imaging Technology Cooperative Innovation Center, Terahertz Technology Innovation Research Institute, Shanghai Key Lab of Modern Optical System, University of Shanghai for Science and Technology, 516 Jungong Road, Shanghai 200093, ChinaKey Laboratory of Terahertz Solid−State Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, 865 Changning Road, Shanghai 200050, ChinaKey Laboratory of Terahertz Solid−State Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, 865 Changning Road, Shanghai 200050, ChinaKey Laboratory of Terahertz Solid−State Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, 865 Changning Road, Shanghai 200050, ChinaKey Laboratory of Terahertz Solid−State Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, 865 Changning Road, Shanghai 200050, ChinaKey Laboratory of Terahertz Solid−State Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, 865 Changning Road, Shanghai 200050, ChinaSchool of Physics, University of Wollongong, Wollongong, NSW 2522, AustraliaTerahertz reflection behaviors of metallic-grating-dielectric-metal (MGDM) microcavity with a monolayer graphene embedded into the dielectric layer are theoretically investigated. A tunable wideband reflection dip at about the Fabry–Pérot resonant frequency of the structure is found. The reflectance at the dip frequency can be electrically tuned in the range of 96.5% and 8.8%. Because of the subwavelength distance between the metallic grating and the monolayer graphene, both of the evanescent grating slit waveguide modes and the evanescent Rayleigh modes play key roles in the strong absorption by the graphene layer. The dependence of reflection behaviors on the carrier scattering rate of graphene is analyzed. A prototype MGDM-graphene structure is fabricated to verify the theoretical analysis. Our investigations are helpful for the developments of electrically controlled terahertz modulators, switches, and reconfigurable antennas based on the MGDM-graphene structures.https://www.mdpi.com/2079-4991/11/2/421terahertzgraphenemicrocavityabsorption enhancementnear field
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Xuguang Guo Lejie Xue Zhenxing Yang Mengjian Xu Yiming Zhu Dixiang Shao Zhanglong Fu Zhiyong Tan Chang Wang Juncheng Cao Chao Zhang
spellingShingle	Xuguang Guo Lejie Xue Zhenxing Yang Mengjian Xu Yiming Zhu Dixiang Shao Zhanglong Fu Zhiyong Tan Chang Wang Juncheng Cao Chao Zhang Strong Terahertz Absorption of Monolayer Graphene Embedded into a Microcavity Nanomaterials terahertz graphene microcavity absorption enhancement near field
author_facet	Xuguang Guo Lejie Xue Zhenxing Yang Mengjian Xu Yiming Zhu Dixiang Shao Zhanglong Fu Zhiyong Tan Chang Wang Juncheng Cao Chao Zhang
author_sort	Xuguang Guo
title	Strong Terahertz Absorption of Monolayer Graphene Embedded into a Microcavity
title_short	Strong Terahertz Absorption of Monolayer Graphene Embedded into a Microcavity
title_full	Strong Terahertz Absorption of Monolayer Graphene Embedded into a Microcavity
title_fullStr	Strong Terahertz Absorption of Monolayer Graphene Embedded into a Microcavity
title_full_unstemmed	Strong Terahertz Absorption of Monolayer Graphene Embedded into a Microcavity
title_sort	strong terahertz absorption of monolayer graphene embedded into a microcavity
publisher	MDPI AG
series	Nanomaterials
issn	2079-4991
publishDate	2021-02-01
description	Terahertz reflection behaviors of metallic-grating-dielectric-metal (MGDM) microcavity with a monolayer graphene embedded into the dielectric layer are theoretically investigated. A tunable wideband reflection dip at about the Fabry–Pérot resonant frequency of the structure is found. The reflectance at the dip frequency can be electrically tuned in the range of 96.5% and 8.8%. Because of the subwavelength distance between the metallic grating and the monolayer graphene, both of the evanescent grating slit waveguide modes and the evanescent Rayleigh modes play key roles in the strong absorption by the graphene layer. The dependence of reflection behaviors on the carrier scattering rate of graphene is analyzed. A prototype MGDM-graphene structure is fabricated to verify the theoretical analysis. Our investigations are helpful for the developments of electrically controlled terahertz modulators, switches, and reconfigurable antennas based on the MGDM-graphene structures.
topic	terahertz graphene microcavity absorption enhancement near field
url	https://www.mdpi.com/2079-4991/11/2/421
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_version_	1724280381620879360

Strong Terahertz Absorption of Monolayer Graphene Embedded into a Microcavity

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