Equivalent circuit model for a graphene-based high efficiency tunable broadband terahertz polarizer

Isa Mazraeh-Fard; Abbas Alighanbari

doi:10.1364/AO.483938

Applied Optics
Vol. 62,
Issue 9,
pp. 2256-2265
(2023)
•https://doi.org/10.1364/AO.483938

Equivalent circuit model for a graphene-based high efficiency tunable broadband terahertz polarizer

Isa Mazraeh-Fard and Abbas Alighanbari

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Isa Mazraeh-Fard and Abbas Alighanbari, "Equivalent circuit model for a graphene-based high efficiency tunable broadband terahertz polarizer," Appl. Opt. 62, 2256-2265 (2023)

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Abstract

An equivalent circuit model for a graphene-based high-efficiency tunable broadband THz polarizer is presented. The conditions for linear-to-circular polarization conversion in the transmission mode are utilized to derive a set of closed-form design formulas. Given a set of target specifications, the key structural parameters of the polarizer are directly calculated using this model. The proposed model is rigorously validated by comparing the circuit model and full-wave electromagnetic simulation results, from which it is found that the model is accurate and effective, accelerating the analysis and design processes. This offers a further step in developing a high-performance and controllable polarization converter with potential applications in imaging, sensing, and communications.

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No.	$W$ [nm]	$f_{0}$ [THz]	Tran. at $f_{0}$	$Δ ϕ$	AR [dB]	FBW	Polar.
1	0 [30]	4.75	55%	93º	$< 3$	17%	Circular
2	2000	4.40	75%	78º	$< 3$	27%	Circular
3	2500	4.20	80%	65º	$< 3$	33%	Circular
4	3000	4.05	88%	50º	$< 3$	37%	Circular
Com.	-	-	$+ 60\%$	-	-	$+ 120\%$	-

Ref.	$f_{0}$ [THz]	FBW	Tran.	Structure	Circuit Model Method
[78]	$f_{01} = 6.1$ $f_{02} = 7.2$ $f_{03} = 7.8$	3.3% 6.5% 3.3%	60%	Complex ✗	✗
[47]	$f_{0} = 1.17$	37%	60%	Complex ✗	✗
[50]	$f_{0} = 4.75$	40%	69%	Simple ✓	✗
[68]	$f_{0} = 4.75$	21%	60%	Simple ✓	✓
[50]	$f_{0} = 4.05$	37%	88%	Simple ✓	✗
This work	$f_{0} = 4.05$	37%	88%	Simple ✓	✓

No.	$W$ [nm]	$f_{0}$ [THz]	Tran. at $f_{0}$	$Δ ϕ$	AR [dB]	FBW	Polar.
1	0 [30]	4.75	55%	93º	$< 3$	17%	Circular
2	2000	4.40	75%	78º	$< 3$	27%	Circular
3	2500	4.20	80%	65º	$< 3$	33%	Circular
4	3000	4.05	88%	50º	$< 3$	37%	Circular
Com.	-	-	$+ 60\%$	-	-	$+ 120\%$	-

Ref.	$f_{0}$ [THz]	FBW	Tran.	Structure	Circuit Model Method
[78]	$f_{01} = 6.1$ $f_{02} = 7.2$ $f_{03} = 7.8$	3.3% 6.5% 3.3%	60%	Complex ✗	✗
[47]	$f_{0} = 1.17$	37%	60%	Complex ✗	✗
[50]	$f_{0} = 4.75$	40%	69%	Simple ✓	✗
[68]	$f_{0} = 4.75$	21%	60%	Simple ✓	✓
[50]	$f_{0} = 4.05$	37%	88%	Simple ✓	✗
This work	$f_{0} = 4.05$	37%	88%	Simple ✓	✓

Abstract

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Applied Optics