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<p>In this paper, we provide a theoretical description of the propagation of surface polaritons bound to a two-dimensional (2D) metallic plane. Specifically, we rigorously discuss how orthonormal eigenvectors for the space including the 2D plane can be obtained. These eigenvectors are shown to consist of a unique surface-bound mode, corresponding to the 2D surface polaritons (2DSPs), along with a continuum of unbound modes, referred to as radiation modes. We demonstrate that although the radiation modes do not directly characterize the propagation of the 2DSPs, they play an important role in manipulating the propagation of 2DSPs.</p>

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Theory of two-dimensional surface polaritons and their propagation

  • 期刊论文

  • 发表日期：

    2025年3月18日

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  • Seojoo Lee,
  • Ji-Hun Kang

摘要

In this paper, we provide a theoretical description of the propagation of surface polaritons bound to a two-dimensional (2D) metallic plane. Specifically, we rigorously discuss how orthonormal eigenvectors for the space including the 2D plane can be obtained. These eigenvectors are shown to consist of a unique surface-bound mode, corresponding to the 2D surface polaritons (2DSPs), along with a continuum of unbound modes, referred to as radiation modes. We demonstrate that although the radiation modes do not directly characterize the propagation of the 2DSPs, they play an important role in manipulating the propagation of 2DSPs.