Dual-broadband and single ultrawideband absorbers from the terahertz to infrared regime

Saeedeh Barzegar-Parizi; Amir Ebrahimi; Kamran Ghorbani

doi:10.1364/JOSAB.432329

Journal of the Optical Society of America B
Vol. 38,
Issue 9,
pp. 2628-2637
(2021)
•https://doi.org/10.1364/JOSAB.432329

Dual-broadband and single ultrawideband absorbers from the terahertz to infrared regime

Saeedeh Barzegar-Parizi, Amir Ebrahimi, and Kamran Ghorbani

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Saeedeh Barzegar-Parizi, Amir Ebrahimi, and Kamran Ghorbani, "Dual-broadband and single ultrawideband absorbers from the terahertz to infrared regime," J. Opt. Soc. Am. B 38, 2628-2637 (2021)

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Abstract

This paper presents the design and analysis of broadband metamaterial absorbers with single and dual absorption bands from terahertz to infrared frequencies. The absorbers are made of a composite graphene/metallic structure. A metallic patch array is printed on a ground-plane-backed dielectric slab. A graphene patch array is stacked on top of the metallic array, whereas a dielectric spacer separates the graphene and patch spacer from each other. The tunable property of the graphene surface conductivity at terahertz frequencies together with the complex permittivity of metal at the infrared regime are used to design broadband absorbers from the terahertz to infrared regime. The design is based on the combination and excitation of the plasmon polaritons of graphene and metallic patterned arrays at terahertz and infrared frequency bands, respectively. Two broad absorption bands occur from 4.56–9.02 THz and 16.95–60.23 THz with the fractional bandwidths of 67% and 112%, respectively. Furthermore, by a proper design of the parameters, a single ultrawide absorption spectra from 6.6–58.13 THz can be achieved with a fractional bandwidth 160%. In order to validate the simulation results, a circuit model-based analysis is developed, where the patterned arrays are modeled as the surface admittances, and the dielectric spacers are modeled by transmission line stubs. The results obtained by the full-wave simulations in the high-frequency structure simulator are in good agreement with the circuit model results. The absorbers show great stability with respect to the incidence angle for both the transverse electric and transverse magnetic waves.

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Data Availability

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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Parameter	Value	Parameter	Value
$D (µ m)$	2.8	$w_{2} (µ m)$	2.5
$w_{1} (µ m)$	2	$h_{2} (µ m)$	6.5
$h_{1} (µ m)$	1.4	$τ$ (ps)	0.04
$t_{m} (n m)$	2.7	$E_{f}$ (eV)	1

Ref.	Central Frequency (THz)	Fractional Bandwidth (%)	Absorption	Structure
[28]	1.6 THz	187.5 % (for	$> 90 %$	One layer of
		the chemical		continuous
		potential of		structured
		0 eV)		graphene
	7.4 THz	31% (for the	$> 90 %$
		chemical
		potential of
		0.3 eV)
[29]	0.94 THz	71%	$> 95 %$	Dielectric layer
	2.64 THz	29.4%	$> 83 %$	(cross-shaped
				grooves) above a
				graphene sheet
[30]	1.6 THz	31.2%	$> 95 %$	Gating layer of
	4.75 THz	10.5%	$> 95 %$	patterned graphene
				above two
				dielectric layers
This work	6.79 THz	67%	$> 87 %$	Two layers of
	32.3 THz	121%	$> 87 %$	metallic and
				graphene patches
				separated by dielectric spacer

Parameter	Value	Parameter	Value
$D (µ m)$	2.6	$w_{2} (µ m)$	2.2
$w_{1} (µ m)$	2.1	$h_{2} (µ m)$	3
$h_{1} (µ m)$	1.4	$τ$ (ps)	0.04
$t_{m} (n m)$	2	$E_{f}$ (eV)	1.5

Ref.	Frequency Band (THz)	Fractional Bandwidth (%)	Polarization Sensitive	Structure
[21]	0.35–1.63	126%	Yes	Two layers of the periodic graphene ribbons arrays
[22]	0.57–2.77	131%	Yes	Three layers of graphene arrays
[23]	0.34–10	186%	No	Dielectric circular truncated cones and a single-layer graphene
[24]	21–40	63%	No	Two layers of graphene disks arrays
[25]	0.88–8.12	161%	No	Snowflake Koch fractal (SKF) dielectric on a graphene sheet
[26]	0.68–7.26	166%	No	Sinusoidal-patterned dielectric layer on a graphene sheet
This work	6.6–58.13	160%	No	Two layers of metallic and graphene patches separated by a dielectric spacer

Parameter	Value	Parameter	Value
$D (µ m)$	2.8	$w_{2} (µ m)$	2.5
$w_{1} (µ m)$	2	$h_{2} (µ m)$	6.5
$h_{1} (µ m)$	1.4	$τ$ (ps)	0.04
$t_{m} (n m)$	2.7	$E_{f}$ (eV)	1

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Equations (13)

Journal of the Optical Society of America B