Propagation length enhancement in a magneto optic plasmonic Mach–Zehnder isolator using graphene

Journal Article · Wed Jan 15 04:00:00 EST 2020 · Optical and Quantum Electronics

DOI:https://doi.org/10.1007/S11082-019-2115-2· OSTI ID:22950029

Hekmatnia, Banafsheh; Naser-Moghadasi, Mohammad; Khatir, Mehdi ^[1]

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1. Islamic Azad University, Department of Electrical and Computer Engineering, Science and Research Branch (Iran, Islamic Republic of)

In this study, a magneto optic plasmonic Mach–Zehnder isolator is designed and simulated in an Insulator–Graphene–Insulator configuration including one layer of graphene. The proposed waveguide takes advantages of propagating graphene’s surface plasmon polaritons (SPPs) at the interface of the graphene and dielectrics. Under special circumstances, in which the imaginary part of the graphene’s conductivity is negative, it behaves as a metal. Therefore, graphene is applied as the conductor layer. In addition, due to the magneto optic effect, nonreciprocal phase shift occurs in the magneto optic branch of the Mach–Zehnder structure. Also, two Yttrium Iron Garnet layers are deployed to create magneto-optic effect. In order to simulate our proposed device, finite difference time domain and mode solutions approaches are utilized. In this regard, propagating constant is extracted through the effective index method. Our proposed device provides considerably larger propagation length in comparison with the conventional plasmonic isolators, in which noble metals such as gold have been developed for SPPs propagation.

• OSTI ID: 22950029
• Journal Information: Optical and Quantum Electronics, Journal Name: Optical and Quantum Electronics Journal Issue: 1 Vol. 52; ISSN OQELDI; ISSN 0306-8919
• Country of Publication: United States
• Language: English

Related Subjects

77 NANOSCIENCE AND NANOTECHNOLOGY
DIELECTRIC MATERIALS
FERRITE GARNETS
GOLD
GRAPHENE
LAYERS
MAGNETO-OPTICAL EFFECTS
PHASE SHIFT
PLASMONS
POLARONS
SIMULATION
SURFACES
WAVEGUIDES
YTTRIUM