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

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Abstract

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.

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Authors and Affiliations

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

    Banafsheh Hekmatnia, Mohammad Naser-Moghadasi & Mehdi Khatir

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  1. Banafsheh Hekmatnia
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  2. Mohammad Naser-Moghadasi
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  3. Mehdi Khatir
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Correspondence to Mohammad Naser-Moghadasi.

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Hekmatnia, B., Naser-Moghadasi, M. & Khatir, M. Propagation length enhancement in a magneto optic plasmonic Mach–Zehnder isolator using graphene. Opt Quant Electron 52, 9 (2020). https://doi.org/10.1007/s11082-019-2115-2

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