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Design of efficient coupling configuration with L-shaped plasmoic waveguide and nanoantenna

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Abstract

A novel design for an efficient coupling configuration, which consists of a L-shaped dielectric loaded surface plasmon polaritons (DLSPPs) waveguide and L-shaped nanoantenna, is proposed and investigated numerically in this paper. We carried out the theoretical analysis for the coupling characteristics by utilizing the finite-difference time-domain (FDTD) method. The factors affecting the coupling efficiency of light from free space to the proposed structure were studied in detail, including the structural parameters and incident light source. The simulation results reveal that the coupling performance of proposed structure with optimized geometric parameters is at least three times enhanced compared to that of a single straight DLSPPs waveguide when the incident light is polarized perpendicular to DLSPPs waveguide at a wavelength of λ = 532 nm. The proposed configuration, which is simple and easy to fabricate, can not only achieve the subwavelength mode confinement but also possesses a relatively high coupling efficiency, thus may potentially be used in nano-photonic coupling circuits and nano-optical manipulation.

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Funding

This work was supported by the start-up foundation for introducing talent of Nanjing University of Information Science and Technology (NUIST), the National Natural Science Foundation of China (Grant nos. 11605090), the Natural Science Foundation of the Jiangsu Province (BK20191396).

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Authors and Affiliations

  1. School of Physics and Optoelectronic Engineering, Nanjing University of Information Science and Technology, Nanjing, 210044, China

    Xiaoman Luo, Jinhua Li & Youqiao Ma

  2. Department of Electrical and Computer Engineering, Dalhousie University, Halifax, NS, B3J 2X4, Canada

    Yuan Ma

  3. Jiangsu Key Laboratory for Optoelectronic Detection of Atmosphere and Ocean, Nanjing University of Information Science and Technology, Nanjing, 210044, China

    Youqiao Ma

Authors
  1. Xiaoman Luo
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  2. Jinhua Li
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  3. Yuan Ma
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  4. Youqiao Ma
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Contributions

XL designed the structures, performed the numerical simulations and wrote the manuscript. YM supervised the project, participated in analysis of the results and reviewed the manuscript. JL and YM participated in analysis of the results and reviewed the manuscript.

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Correspondence to Youqiao Ma.

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Luo, X., Li, J., Ma, Y. et al. Design of efficient coupling configuration with L-shaped plasmoic waveguide and nanoantenna. Opt Rev 30, 462–468 (2023). https://doi.org/10.1007/s10043-023-00827-7

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  • DOI: https://doi.org/10.1007/s10043-023-00827-7

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