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<p>With the rapid advancements in silicon photonic devices, an increasing demand for high-integration and high-performance waveguide components needs to be satisfied. In this paper, a novel design scheme is proposed to utilise the strong optical confinement property of surface plasmon polaritons (SPPs) for light in the sub-wavelength scale to break through the limitations of traditional silicon waveguides in terms of size and performance. The adopted metal–insulator-metal (MIM) structure not only possesses optical field confinement capability, but also significantly enhances the local electric field intensity. We combine SPPs with silicon waveguides to introduce a novel horizontal MIM structure, which obtains the effectively compact device size (up to 2.7&#xa0;μm). This scheme not only optimizes the process of light-matter interaction in our device, but also proposes an effective solution for ultra-compact silicon photonic devices. Due to the high performance and miniaturization, this design structure has broad potentials to be employed in the applications of nanophotonics.</p>

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Wedge-Shaped Silicon Waveguide Devices Based on Surface Plasmon Polaritons Effect

  • 期刊论文

  • 发表日期：

    2025年5月22日

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  • Xuhong Chen,
  • Lidan Lu,
  • Jinyi Du,
  • Bangze Wu,
  • Guang Chen,
  • Lianqing Zhu

摘要

With the rapid advancements in silicon photonic devices, an increasing demand for high-integration and high-performance waveguide components needs to be satisfied. In this paper, a novel design scheme is proposed to utilise the strong optical confinement property of surface plasmon polaritons (SPPs) for light in the sub-wavelength scale to break through the limitations of traditional silicon waveguides in terms of size and performance. The adopted metal–insulator-metal (MIM) structure not only possesses optical field confinement capability, but also significantly enhances the local electric field intensity. We combine SPPs with silicon waveguides to introduce a novel horizontal MIM structure, which obtains the effectively compact device size (up to 2.7 μm). This scheme not only optimizes the process of light-matter interaction in our device, but also proposes an effective solution for ultra-compact silicon photonic devices. Due to the high performance and miniaturization, this design structure has broad potentials to be employed in the applications of nanophotonics.