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<p>In this paper, we demonstrate magnetically controlled unidirectional propagation of graphene surface plasmons (GSPs) through a hybrid graphene-InSb-metallic structure. Analytical modeling reveals asymmetric dispersion relations for GSPs in magneto-optical graphene-InSb systems under external magnetic fields. A nanograting-based Salisbury screen configuration is employed to excite multiple plasmonic resonances (45–70 THz), where magnetic biasing induces splitting of primary resonances into directionally selective modes. Systematic investigations establish the dependence of unidirectional GSPs excitation on critical parameters including magnetic field intensity, graphene grating amplitude, and reflector spacing. Furthermore, we successfully demonstrate a finite-grating configuration functioning as a practical unidirectional GSPs source, verified through numerical simulations. The proposed architecture shows significant potential for developing magneto-tunable nanophotonic devices, including infrared plasmonic emitters and GSPs-based optical switches, with promising applications in next-generation nano-optical integrated circuits.</p>

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Magnetic Field-Controlled Directional Excitation of Infrared Graphene Plasmons for Nano-optical Devices

  • 期刊论文

  • 发表日期：

    2025年5月6日

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  • Bin Sun,
  • Feifeng Xie,
  • Juan He,
  • Shuai Kang,
  • Lei Chen

摘要

In this paper, we demonstrate magnetically controlled unidirectional propagation of graphene surface plasmons (GSPs) through a hybrid graphene-InSb-metallic structure. Analytical modeling reveals asymmetric dispersion relations for GSPs in magneto-optical graphene-InSb systems under external magnetic fields. A nanograting-based Salisbury screen configuration is employed to excite multiple plasmonic resonances (45–70 THz), where magnetic biasing induces splitting of primary resonances into directionally selective modes. Systematic investigations establish the dependence of unidirectional GSPs excitation on critical parameters including magnetic field intensity, graphene grating amplitude, and reflector spacing. Furthermore, we successfully demonstrate a finite-grating configuration functioning as a practical unidirectional GSPs source, verified through numerical simulations. The proposed architecture shows significant potential for developing magneto-tunable nanophotonic devices, including infrared plasmonic emitters and GSPs-based optical switches, with promising applications in next-generation nano-optical integrated circuits.