Dual-band polarization insensitive graphene-based reconfigurable absorber in a terahertz regime

Asha Verma; Om Prakash Meena; Om Prakash Meena

doi:10.1364/AO.513884

Applied Optics
Vol. 63,
Issue 8,
pp. 1934-1938
(2024)
•https://doi.org/10.1364/AO.513884

Dual-band polarization insensitive graphene-based reconfigurable absorber in a terahertz regime

Asha Verma and Om Prakash Meena

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Asha Verma and Om Prakash Meena, "Dual-band polarization insensitive graphene-based reconfigurable absorber in a terahertz regime," Appl. Opt. 63, 1934-1938 (2024)

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- Fiber Optics, Fiber Sensors, and Optical Communications
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About this Article
History
- Original Manuscript: November 20, 2023
- Revised Manuscript: January 18, 2024
- Manuscript Accepted: February 8, 2024
- Published: March 4, 2024

Abstract

In this paper, a dual-band graphene-based absorber is structured and investigated in a terahertz frequency domain. The designed absorber contains a plus-shaped graphene sheet, as well as four dual concentric graphene-based rings. It is designed according to the ${{\text{SiO}}_2}$-based substrate. A dual concentric graphene ring provides more than 90% absorption from 2.36–3.24 THz, while a plus-shaped graphene sheet is accountable for absorption from 5.0–5.32 THz. The maximum absorption is found at 2.56, 3.08, and 5.16 THz with 99.81%, 97.34%, and 99.74%, respectively. The variation in the chemical potential of the graphene material offers re-configurability in the dual absorption bands. Due to the four-fold symmetry of the designed structure, the absorptivity value is approximately constant for various polarizations with a wide incident angle (more than 60°). The aforementioned features of the proposed graphene-based absorber make it appropriate in a terahertz frequency regime.

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Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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Symbol	Dimension (µm)	Symbol	Dimension (µm)
$L_{S}$	20.0	$r_{1}$	4.0
$W_{S}$	20.0	$r_{2}$	3.5
$L_{1}$	20.0	$r_{3}$	2.5
$W_{1}$	2.0	$r_{4}$	2.0

Absorbing Structures	Number of Working Bands	Absorption Bandwidth (more than 90% absorptivity)	Maximum Absorptivity	Polarization Insensitivity	Re-Configurability
Meta-material absorber [4]	02	0.02 and 0.05 THz	0.95	No	No
Meta-material absorber [5]	02	0.01 and 0.06 THz	0.94	Yes (up to $θ = 30^{\circ}$ )	No
Graphene absorber [6]	02	0.16 and 0.25 THz	0.95	No	Yes
Graphene absorber [7]	02	0.09 and 0.12 THz	0.98	Yes ( $θ$ not given)	Yes
Graphene absorber [8]	01	5.98 THz	0.92	Yes (up to $θ = 50^{\circ}$ )	Yes
Graphene absorber [9]	01	1.1 THz	0.94	Yes (up to $θ = 70^{\circ}$ )	No
Graphene absorber [10]	01	0.93	0.91	Yes (up to $θ = 55^{\circ}$ )	Yes
Graphene absorber [11]	01	0.9	0.98	No	Yes
Graphene absorber [12]	01	0.3	0.98	Yes (up to $θ = 40^{\circ}$ )	Yes
Graphene absorber [12]	01	1.3	0.98	No	Yes
Proposed Absorber	02	0.69 and 0.32 THz	0.98	Yes (more than $θ = 60^{\circ}$ )	Yes

Symbol	Dimension (µm)	Symbol	Dimension (µm)
$L_{S}$	20.0	$r_{1}$	4.0
$W_{S}$	20.0	$r_{2}$	3.5
$L_{1}$	20.0	$r_{3}$	2.5
$W_{1}$	2.0	$r_{4}$	2.0

Absorbing Structures	Number of Working Bands	Absorption Bandwidth (more than 90% absorptivity)	Maximum Absorptivity	Polarization Insensitivity	Re-Configurability
Meta-material absorber [4]	02	0.02 and 0.05 THz	0.95	No	No
Meta-material absorber [5]	02	0.01 and 0.06 THz	0.94	Yes (up to $θ = 30^{\circ}$ )	No
Graphene absorber [6]	02	0.16 and 0.25 THz	0.95	No	Yes
Graphene absorber [7]	02	0.09 and 0.12 THz	0.98	Yes ( $θ$ not given)	Yes
Graphene absorber [8]	01	5.98 THz	0.92	Yes (up to $θ = 50^{\circ}$ )	Yes
Graphene absorber [9]	01	1.1 THz	0.94	Yes (up to $θ = 70^{\circ}$ )	No
Graphene absorber [10]	01	0.93	0.91	Yes (up to $θ = 55^{\circ}$ )	Yes
Graphene absorber [11]	01	0.9	0.98	No	Yes
Graphene absorber [12]	01	0.3	0.98	Yes (up to $θ = 40^{\circ}$ )	Yes
Graphene absorber [12]	01	1.3	0.98	No	Yes
Proposed Absorber	02	0.69 and 0.32 THz	0.98	Yes (more than $θ = 60^{\circ}$ )	Yes

Abstract

Data availability

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Figures (9)

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Equations (5)

Applied Optics