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<p>In this research, we conduct a quantitative evaluation of the field intensity associated with surface plasmons (SPs). This evaluation is carried out by comparing the analytical case of a plane wave applied to the Kretschmann and Otto configurations with the case of a spatially finite source. In the latter, the finite-difference time-domain (FDTD) method is employed within the aforementioned geometries. Additionally, a simulated dielectric-graphene structure is introduced in the Kretschmann configuration with the aim of enhancing the amplification and reflection properties of the magnetic field. Furthermore, the metal layer width is reduced in both configurations to determine the optimal excitation and concentration of energy at the surface. The results show that, in all cases, there exists an optimal metal or dielectric-graphene width that yields the maximum magnetic field amplitude.</p>

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Enhancement of Electromagnetic Fields Under Surface Plasmons with Modified Otto and Kretschmann Geometries and Graphene-Dielectric Structure on Kretschmann

  • 期刊论文

  • 发表日期：

    2025年7月29日

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  • Jesús Manuel Gutierrez Villarreal,
  • Ian M. Sosa-Tinoco,
  • Luis Angel Mayoral Astorga,
  • Mario Francisco Suzuki Valenzuela,
  • PA Limon-Leyva

摘要

In this research, we conduct a quantitative evaluation of the field intensity associated with surface plasmons (SPs). This evaluation is carried out by comparing the analytical case of a plane wave applied to the Kretschmann and Otto configurations with the case of a spatially finite source. In the latter, the finite-difference time-domain (FDTD) method is employed within the aforementioned geometries. Additionally, a simulated dielectric-graphene structure is introduced in the Kretschmann configuration with the aim of enhancing the amplification and reflection properties of the magnetic field. Furthermore, the metal layer width is reduced in both configurations to determine the optimal excitation and concentration of energy at the surface. The results show that, in all cases, there exists an optimal metal or dielectric-graphene width that yields the maximum magnetic field amplitude.