Wideband Polarization Insensitive Tunable Graphene-Supported Terahertz Metamaterial Absorber

Wideband Polarization Insensitive Tunable Graphene-Supported Terahertz Metamaterial Absorber

Broadband Terahertz (THz) metamaterial absorbers with tunable absorption characteristics have been attracting a lot of attention due to their high demand and utilization in advanced optical systems. Therefore, we propose a single-layer graphene-supported metamaterial absorber with a combination of s...

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Bibliographic Details
Main Authors: Muhammad Abdul Jabbar, Muhammad Ashar Naveed, Muhammad Zubair, Muhammad Qasim Mehmood, Yehia Massoud
Format: Article
Language:English
Published: IEEE 2023-01-01
Series:IEEE Photonics Journal
Subjects:
Absorber
broadband
graphene
PCR
terahertz
tunable
Online Access:https://ieeexplore.ieee.org/document/10295980/
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Summary:Broadband Terahertz (THz) metamaterial absorbers with tunable absorption characteristics have been attracting a lot of attention due to their high demand and utilization in advanced optical systems. Therefore, we propose a single-layer graphene-supported metamaterial absorber with a combination of square, circular and cross-shaped meta-resonators, exhibiting an outstanding absorption of more than 90&#x0025; from 2.3 THz to 6.4 THz. The overall size of the unit cell is 15 &#x00D7; 15 &#x03BC;m<sup>2</sup>, which holds graphene-based meta-resonators etched over a lossy dielectric substrate, backed by a 0.2 &#x03BC;m thick gold as a perfect reflector. This design architecture achieves the ultra-broadband absorption features by continuous design evaluation and optimization. The graphene-based metamaterial absorber (GMMA) reveals a polarization-insensitive response, and it also provides above 70&#x0025; absorption for obliquely incident angles over the large operating bandwidth (2.3&#x2013;6.4 THz). The polarization conversion ratio (PCR) also approached zero over the wideband of 4.1 THz and its maximum value of 16&#x0025; was recorded at 4 THz. Furthermore, the amplitude spectra of the proposed GMMA is modulated from 19&#x0025; to above 90&#x0025; by stimulating the chemical potential of graphene from 0 eV to 0.7 eV. The simplified design configuration, broadband absorption features, and tunable capability of the GMMA provide the pathway to develop high-speed optical switches, THz detectors, and other opto-electronic devices.
ISSN:1943-0655

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