Bidirectional terahertz plasmonic switch based on&#x00A0;periodically structured graphene

Mehdi Dehghan; Mohammad Kazem Moravvej-Farshi; Masoud Jabbari; Ghafar Darvish; Mohsen Ghaffari-Miab

doi:10.1364/JOSAB.484590

Journal of the Optical Society of America B
Vol. 40,
Issue 7,
pp. 1773-1778
(2023)
•https://doi.org/10.1364/JOSAB.484590

Bidirectional terahertz plasmonic switch based on periodically structured graphene

Mehdi Dehghan, Mohammad Kazem Moravvej-Farshi, Masoud Jabbari, Ghafar Darvish, and Mohsen Ghaffari-Miab

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Mehdi Dehghan, Mohammad Kazem Moravvej-Farshi, Masoud Jabbari, Ghafar Darvish, and Mohsen Ghaffari-Miab, "Bidirectional terahertz plasmonic switch based on periodically structured graphene," J. Opt. Soc. Am. B 40, 1773-1778 (2023)

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Abstract

A plasmonic crystal structure is proposed and simulated based on graphene at terahertz frequency using the three-dimensional finite element method. The proposed model involves both an ON/OFF and a directional switch. Implementing a crystalline structure in graphene can enhance absorption since such a structure creates a bandgap wherein no propagation mode is allowed. Accordingly, the ON/OFF and directional switches can be designed with an extinction ratio higher than 30 dB. Other advantages of this structure are its high quality factor and small dimensions of 1 µm (for the ON/OFF switch) and 2 µm (for the directional switch).

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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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GPlC	$r$ (nm)	$d$ (nm)
$4 \times 4$	36	214.4
$5 \times 5$	36	178
$7 \times 7$	36	134
$9 \times 9$	36	107.2

Symbol	Definition	Value (nm)
$t_{1}$	hBN above the Ag layer	500
$t_{2}$	Ag thickness	30
$t_{3}$	hBN layer between the graphene and Ag layers	50
$w$	Slit width	100
$r_{1}$	Hole radii on the left side of the slit	125
$d_{1}$	Lattice constant of the periodic structure on the left side of the slit	300
$r_{2}$	Hole radii on the right side of the slit	80
$d_{2}$	Lattice constant of the periodic structure on the right side of the slit	228

Reference	Size (µm)	Extinction Ratio (dB)	$λ$ (µm)
[41]	1.1	18.4	0.98
[42]	1	21	0.73
[43]	1	23	1.31
[44]	10	12	1.55
[45]	1.01	5	1.55
[46]	1.2	17.7	42.85
[47]	1	17.5	30
This work	2	28.8	33.33

GPlC	$r$ (nm)	$d$ (nm)
$4 \times 4$	36	214.4
$5 \times 5$	36	178
$7 \times 7$	36	134
$9 \times 9$	36	107.2

Symbol	Definition	Value (nm)
$t_{1}$	hBN above the Ag layer	500
$t_{2}$	Ag thickness	30
$t_{3}$	hBN layer between the graphene and Ag layers	50
$w$	Slit width	100
$r_{1}$	Hole radii on the left side of the slit	125
$d_{1}$	Lattice constant of the periodic structure on the left side of the slit	300
$r_{2}$	Hole radii on the right side of the slit	80
$d_{2}$	Lattice constant of the periodic structure on the right side of the slit	228

Mehdi Dehghan	https://orcid.org/0000-0002-9318-3533
Mohammad Kazem Moravvej-Farshi	https://orcid.org/0000-0002-8954-6418
Ghafar Darvish	https://orcid.org/0000-0003-1629-5918
Mohsen Ghaffari-Miab	https://orcid.org/0000-0002-8638-2753

Abstract

Data availability

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Figures (7)

Tables (3)

Equations (4)

Journal of the Optical Society of America B