Abstract
Surface plasmons have the unique advantages of local field enhancement and subwavelength field confinement, thus have been widely used in subwavelength photonic as well as nanoscale imaging, nano-lasers, and nonlinear optics. In this work, we report a cylindrical composite hybrid plasmonic waveguide, which supports a plasmon mode with ultra-strong field confinement that is formed due to the coupling of the surface plasmon mode in the Na nanowire waveguide and hybrid surface plasmon mode in the Na-based cylindrical hybrid waveguide. The modal properties of the proposed waveguide are thoroughly investigated by using the finite element method. The proposed structure allows the mode coupling to be enhanced, which in turn gives it superior performance. Further, the optimized parameters are determined, under which the waveguide exhibits an ultra-small normalized mode area of 1.52 × 10−5 and a high figure of merit over 3.2 × 103. The proposed waveguide may make a contribution to the development of nanoscale devices in photonic integrated circuits, such as nanowaveguides, resonators, and nano-lasers.
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Funding
Natural Science Foundation of Henan (242300420667), Key Scientific Research Project of Colleges and Universities in Henan Province (24B140014), Higher Education Teaching Reform Research and Practice Project of Henan Province (2024SJGLX0524), Innovative and Experimental Project for students of Zhengzhou Normal University (DCZ2023016).
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Da Teng proposed the concept and supervised the research. Yongmei Tian developed methodology in the given study. Yongmei Tian and Rumeng Zhang performed the calculations and analyzed numerical data. All the authors have discussed the results thoroughly and contributed to the writing and review of the manuscript.
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Tian, Y., Zhang, R. & Teng, D. Cylindrical Composite Hybrid Plasmonic Waveguides with Ultra-Strong Field Confinements: A FEM Study. Plasmonics (2024). https://doi.org/10.1007/s11468-024-02352-y
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DOI: https://doi.org/10.1007/s11468-024-02352-y