Polarization-Insensitive, Broadband, and Tunable Terahertz Absorber Using Slotted-Square Graphene Meta-Rings

Graphene-based metamaterials are gaining popularity for developing various reconfigurable and electrically tunable optical devices - especially in terahertz (THz) and infrared (IR) bands. Therefore, in this paper, we aim to investigate the broadband metamaterial-based absorber that efficiently absor...

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Bibliographic Details
Published in:IEEE photonics journal 2023-02, Vol.15 (1), p.1-8
Main Authors: Zakir, Subhan, Bilal, Rana Muhammad Hasan, Naveed, Muhammad Ashar, Baqir, Muhammad Abuzar, Khan, Muhammad Usman Ali, Ali, Muhammad Mahmood, Saeed, Muhammad Ahsan, Mehmood, Muhammad Qasim, Massoud, Yehia
Format: Article
Language:English
Subjects:
absorber
Absorbers
Absorbers (materials)
Absorption
Broadband
Broadband communication
Chemical potential
Graphene
Metamaterials
Optical sensors
Polarization
polarization-insensitive metamaterial
Resonant frequency
Terahertz frequencies
Terhertz
tunable
Wideband
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Summary:Graphene-based metamaterials are gaining popularity for developing various reconfigurable and electrically tunable optical devices - especially in terahertz (THz) and infrared (IR) bands. Therefore, in this paper, we aim to investigate the broadband metamaterial-based absorber that efficiently absorbs the THz radiation ranging from 2.2 to 4.6 THz. The proposed absorber comprises a simple meta-square ring of graphene, which possesses different slots in its structure to induce multiple plasmonic resonances. It is observed that the proposed absorber manifests above 95% absorption for the normally incident THz waves, and it also maintains its absorption value over 80% for different obliquely incident operating conditions. Furthermore, the proposed absorber shows polarization-insensitive features. In addition, the absorption characteristics regulate from 95% to 15% by adjusting the chemical potential of graphene from 1 eV to 0.1 eV. Some of the salient features of the proposed absorber is largest reported bandwidth for single layer absorber with smallest footprint without sacrificing polarization insensitivity or amplitude tunability. From the application point of view, it could provide the pathway for implementing switching, cloaking, smart absorbers, and detection phenomena in the THz range.
ISSN:1943-0655
1943-0647
DOI:10.1109/JPHOT.2022.3229900