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Finite-element Method Analysis of Sodium Based Elliptical Hybrid Plasmonic Waveguides with Ultra-low Loss

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Abstract

Surface plasmons possess the capability to overcome the diffraction limit, making them highly promising for a wide range of applications in the field of nanophotonics. Here we design a sodium-based hybrid plasmonic waveguide consisting of an elliptical Si nanowire separated from the Na film by a low-index SiO2 layer. The modal properties of the proposed waveguide are thoroughly investigated by using the finite element method with a focus on parameters such as effective mode index, propagation length, normalized mode area, and figure of merit. The results show that the hybrid modes exhibit ultra-low loss with propagation length in the millimeter range as well as high figure of merit over 103. Besides, the hybrid plasmonic waveguide with a vertical elliptical nanowire provides a stronger energy constrain ability compared with that with a horizontal elliptical nanowire. The proposed waveguide may contribute to the development of nanoscale devices in photonic integration circuits, such as lasers, sensors, and modulators.

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Data Availability

The numerical analysis is done with Comsol Multiphysics and also data will be available on reasonable request.

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Funding

Key Scientific Research Project of Colleges and Universities in Henan Province (24B140014), Special Fund for the Construction of Innovative Experimental Plan for College Students of Zhengzhou Normal University (DCY2022006), Henan Student’s Project for Innovation and Entrepreneurship Training Program (202312949013).

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Authors and Affiliations

  1. General Education Center, Zhengzhou Business University, Zhengzhou, 451200, Henan, China

    Lingjie Bu

  2. College of Physics and Electronic Engineering, Zhengzhou Normal University, Zhengzhou, 450044, Henan, China

    Yuying Liu, Rumeng Zhang & Da Teng

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  1. Lingjie Bu
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  2. Yuying Liu
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Contributions

Da Teng proposed the concept and supervised the research. Lingjie Bu developed methodology in the given study. Lingjie Bu, Yuying Liu 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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Correspondence to Da Teng.

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Bu, L., Liu, Y., Zhang, R. et al. Finite-element Method Analysis of Sodium Based Elliptical Hybrid Plasmonic Waveguides with Ultra-low Loss. Plasmonics (2023). https://doi.org/10.1007/s11468-023-02114-2

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