Ultrafast tunable integrated Faraday isolator based on optical pumping in a graphene–InSb–graphene structure

Amir Hossein Kazemi; Arash Mokhtari; Mehdi Zamani

doi:10.1364/AO.396879

Applied Optics
Vol. 59,
Issue 26,
pp. 7745-7751
(2020)
•https://doi.org/10.1364/AO.396879

Ultrafast tunable integrated Faraday isolator based on optical pumping in a graphene–InSb–graphene structure

Amir Hossein Kazemi, Arash Mokhtari, and Mehdi Zamani

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Amir Hossein Kazemi, Arash Mokhtari, and Mehdi Zamani, "Ultrafast tunable integrated Faraday isolator based on optical pumping in a graphene–InSb–graphene structure," Appl. Opt. 59, 7745-7751 (2020)

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Abstract

We have designed a new class of single-stage Faraday isolators that employs two sheets of graphene. Using nonreciprocal optical materials such as InSb boosts plasmonic coupling between the graphene layers, which leads to a 45 deg polarization rotation as well as increased transmission through the structure. More than 91% transmission is achieved in the THz band (1 THz–7 THz). This design opens up the way in ultrafast integrated magneto-optical nanophotonic devices to realize single-stage isolators with enhanced transmittance in the THz band.

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Reference	Structure	FR(deg)
[37]	Periodic graphene microribbons	B = 1 T	3.1
		B = 4 T	9
		B = 7 T	7
		B = 10 T	5.1
[35]	Bilayer planar graphene $+$ SiC	B = 0.5 T	0.3
		B = 1 T	0.5
		B = 2 T	1.15
		B = 3 T	2
		B = 4 T	3.3
		B = 5 T	5
		B = 6 T	6.5
		B = 7 T	8
[35]	$(S i \| S i O_{2})^{n} (g r a p h e n e \| S i C) (S i \| S i O_{2})^{n}$	B = 3 T	−15
[56]	$(P C_{1}) (g r a p h e n e) (P C_{2})$	B = 1 T	−0.3
[57]	Bilayer planar graphene $+$ SiC	B = 25 T	0.12
		B = 30 T	0.15
		B = 40 T	0.2
[58]	Graphene microstructure ( $L$ shaped)	B = 0 T	9
[53]	Double-layer graphene disks	B = 0 T	−12
		B = 5 T	−19
[15]	Single layer of graphene	B = 4 T	27.67
	Double layer of graphene	B = 4 T	33.16
This work	Double layer of graphene with InSb	B = 0.43 T	45

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Applied Optics