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On the Plasmonic Properties of a Bi-Metallic Eccentric Ring-Disk Nanostructure

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Abstract

This work reports on the plasmonic properties of an eccentric nanostructure consisting of a silver ring and a gold disk, in the frequency regime of several hundreds of tetrahertz. In the structure, a gold nanodisk is located in a silver nanoring, with the centers of the two metals being set apart. As the radius of the gold disk, the separation between the centers, the light polarization, and the refractive index of the surrounding dielectric material are respectively varied, the normalized scattering cross section of the system is numerically simulated, using the finite difference time domain method. Multiple plasmonic resonances are observed, the plasmonic coupling effect between the ring and the disk is revealed, and the corresponding electromagnetic field distributions are demonstrated. The resonance peak associated with the coupling is found to possess a Fano-like lineshape, and it is well fitted to a model that employs a Fano function. The resonance frequency, the spectral width, and the characteristic q factor are determined from the best-fit parameters, and the plasmonic characteristics of the eccentric nanostructure are quantitatively probed. The results in this work may be of significance in designs of plasmonic devices that are based on bi-metallic eccentric structures.

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No datasets were generated or analysed during the current study.

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Funding

This study was funded by the Education Department Basic Scientific Research Project of Liaoning Province of China (grant no. LJKQZ2021171).

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Authors and Affiliations

  1. College of Physical Science and Technology, Dalian University, Dalian, 116622, China

    Xinyu He & Cheng Sun

  2. Liaoning Engineering Laboratory of Optoelectronic Information Technology, Dalian, 16622, China

    Xinyu He & Cheng Sun

Authors
  1. Xinyu He
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  2. Cheng Sun
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Contributions

All authors contributed to the study conception and design. Software, analysis and figures were performed by Xinyu He. Methodology and investigation by Cheng Sun. The original draft of the manuscript was written by Xinyu He and Cheng Sun. All authors read and approved the final manuscript.

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Correspondence to Cheng Sun.

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He, X., Sun, C. On the Plasmonic Properties of a Bi-Metallic Eccentric Ring-Disk Nanostructure. Plasmonics (2024). https://doi.org/10.1007/s11468-023-02184-2

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