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<p>Terahertz waves have the potential to become a key tool for enhancing the data capacity and transmission efficiency of next-generation communication technologies. In optical transmission systems, wavelength division multiplexers and splitters are indispensable components, playing a central role in the architecture of photonic integrated circuits. This study explores several terahertz spoof surface plasmon functional devices based on the theory of multimode interference (MMI). Initially, the applicability of MMI imaging to terahertz plasmonic waveguides was validated. Subsequently, the influence of varying the dimensions of the multimode region to control the transmission of higher-order modes was theoretically confirmed. Finally, wavelength division multiplexers and 1 × 3 and 1 × 4 optical power splitters were fabricated by leveraging the self-imaging and <i>N</i>-fold imaging effects. The research results demonstrate that these functional devices exhibit excellent performance characteristics. These devices hold considerable promise for integration into terahertz communication systems.</p>

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Terahertz spoof surface-plasmon-polariton functional devices based on multimode interference

  • 期刊论文

  • 发表日期：

    2025年5月26日

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  • Shuo Liu,
  • Shenghao Gu,
  • Haixia Li,
  • Ya Liu,
  • Ying Zhang

摘要

Terahertz waves have the potential to become a key tool for enhancing the data capacity and transmission efficiency of next-generation communication technologies. In optical transmission systems, wavelength division multiplexers and splitters are indispensable components, playing a central role in the architecture of photonic integrated circuits. This study explores several terahertz spoof surface plasmon functional devices based on the theory of multimode interference (MMI). Initially, the applicability of MMI imaging to terahertz plasmonic waveguides was validated. Subsequently, the influence of varying the dimensions of the multimode region to control the transmission of higher-order modes was theoretically confirmed. Finally, wavelength division multiplexers and 1 × 3 and 1 × 4 optical power splitters were fabricated by leveraging the self-imaging and N-fold imaging effects. The research results demonstrate that these functional devices exhibit excellent performance characteristics. These devices hold considerable promise for integration into terahertz communication systems.