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<p>In this study, we studied FDTD<b>-</b>simulated transmission spectrum and near-field distribution images of nanoholes in two-layered gold (Au) films. The near-field images revealed clear interference patterns stemming from the interaction of forward and reflected surface plas1ma polaritons (SPPs). The two-layered Au film with nanoholes of different radii could focus the electric field within an area of ~ 100&#xa0;nm, with an enhancement of ~ 11 times the incident electric field in the near-field images. Simulations of the near-field distributions of the two-layered Au film, after introducing a nanowire at the exit of the second nanohole, further reduced the electric field focusing width to a few tens of nanometers, i.e., an enhancement of ~ 8 times the incident electric field. Better focus and enhancement are present in the secondary focusing images in this letter.</p>

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Secondary focusing of nanoholes of two-layered gold films

  • 期刊论文

  • 发表日期：

    2025年12月24日

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  • Jiang-Yan Li,
  • Chunmei Wang,
  • Wei Liu,
  • Wenxue Wang,
  • Ning Yin,
  • Ying Su,
  • Xueyan Han,
  • Mengmeng Wang,
  • Chunbo Zhao

摘要

In this study, we studied FDTD-simulated transmission spectrum and near-field distribution images of nanoholes in two-layered gold (Au) films. The near-field images revealed clear interference patterns stemming from the interaction of forward and reflected surface plas1ma polaritons (SPPs). The two-layered Au film with nanoholes of different radii could focus the electric field within an area of ~ 100 nm, with an enhancement of ~ 11 times the incident electric field in the near-field images. Simulations of the near-field distributions of the two-layered Au film, after introducing a nanowire at the exit of the second nanohole, further reduced the electric field focusing width to a few tens of nanometers, i.e., an enhancement of ~ 8 times the incident electric field. Better focus and enhancement are present in the secondary focusing images in this letter.