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<p>This paper presents the design and numerical analysis of a compact 1 × 3 plasmonic optical demultiplexer, investigates plasmonic filters as key components in the design, and discusses the advantages of Metal-Dielectric-Metal (MIM) waveguides for high-throughput optical integration, due to their capability of confining light beyond the diffraction limit and enabling high-density integration. A 1 × 3 optical demultiplexer is designed in a plasmonic nanostructure, consisting of three elliptical resonators, and was designed using silver and air as metal and dielectric materials, respectively. The resonators have dimensions of 3000 × 1200 nm<sup>2</sup>, enabling a highly compact footprint suitable for on-chip optical communication systems, and operate at wavelength channels of 910, 1170, and 1120 nm, respectively. The proposed structures were numerically investigated using the Finite Element Method (FEM) implemented in COMSOL Multiphysics 5.6 software. The results obtained from the designed demultiplexers show a Full Width at Half Maximum(FWHM) of 13.5 nm with a high Q-Factor of 73 at a resonance wavelength of 910 nm. The proposed design offers a simple structure, high performance, and strong potential for integration into photonic integrated circuits, and owing to its convenient size, makes it a promising candidate for advanced optical communication and wavelength-division multiplexing (WDM) applications.</p>

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Study and numerical analysis for the design of a 1 × 3 demultiplexer with a high‑quality factor based on metal–insulator-metal plasmonic waveguides

  • 期刊论文

  • 发表日期：

    2026年7月10日

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  • Karrar Ali. Kzar,
  • Ahmed Ghanim Wadday,
  • Sinnan M. Abdulsatar

摘要

This paper presents the design and numerical analysis of a compact 1 × 3 plasmonic optical demultiplexer, investigates plasmonic filters as key components in the design, and discusses the advantages of Metal-Dielectric-Metal (MIM) waveguides for high-throughput optical integration, due to their capability of confining light beyond the diffraction limit and enabling high-density integration. A 1 × 3 optical demultiplexer is designed in a plasmonic nanostructure, consisting of three elliptical resonators, and was designed using silver and air as metal and dielectric materials, respectively. The resonators have dimensions of 3000 × 1200 nm2, enabling a highly compact footprint suitable for on-chip optical communication systems, and operate at wavelength channels of 910, 1170, and 1120 nm, respectively. The proposed structures were numerically investigated using the Finite Element Method (FEM) implemented in COMSOL Multiphysics 5.6 software. The results obtained from the designed demultiplexers show a Full Width at Half Maximum(FWHM) of 13.5 nm with a high Q-Factor of 73 at a resonance wavelength of 910 nm. The proposed design offers a simple structure, high performance, and strong potential for integration into photonic integrated circuits, and owing to its convenient size, makes it a promising candidate for advanced optical communication and wavelength-division multiplexing (WDM) applications.