Dynamically Electrically Tunable Broadband Absorber Based on Graphene Analog of Electromagnetically Induced Transparency

A broadband absorber, which is composed of graphene analog of electromagnetically induced transparency (EIT) and a metal ground plane spaced by a thin SiO 2 dielectric layer, is proposed and investigated. Numerical results reveal that the working bandwidth can be dynamically tuned between broadband...

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Bibliographic Details
Published inIEEE photonics journal Vol. 8; no. 1; pp. 1 - 8
Main Authors Yao, Gang, Ling, Furi, Yue, Jin, Luo, Chunya, Luo, Qin, Yao, Jianquan
Format Journal Article
LanguageEnglish
Published IEEE 01.02.2016
Subjects
Absorption
Broadband
Broadband communication
Dielectrics
Disengaging
Electric fields
Electrostatics
Fermi level
Graphene
Ground plane
Metamaterials
Photonics
Strip
Strips
Subwavelength structures
THZ optics
THZ optics
metamaterials
subwavelength structures
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Summary:A broadband absorber, which is composed of graphene analog of electromagnetically induced transparency (EIT) and a metal ground plane spaced by a thin SiO 2 dielectric layer, is proposed and investigated. Numerical results reveal that the working bandwidth can be dynamically tuned between broadband absorption and narrowband absorption by varying the Fermi level of graphene through controlling of the electrostatic gating. Furthermore, absorption behaviors can be tuned to the state of off when the electric polarized is rotated to another axis. It is also found that the coupling strength between the radiative element and dark element is tuned by the distance between the disconnected vertical graphene strip and horizontal graphene strip. In addition, this type of graphene-based absorber is very sensitive to the incident angles.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
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ISSN:1943-0655
1943-0655
1943-0647
DOI:10.1109/JPHOT.2015.2513210