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The Multipolar Contribution and Plasmon Hybridization in Core–Shell Clusters

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Abstract

Core–shell structures exhibit excellent versatility, tunability, and stability due to the different material compositions. Here, we synthesized the core–shell structure (SiO2@Au) by sol–gel method and measured the scattering spectra of its monomer, dimer, and trimer by dark field technique. Meanwhile, the contribution of multipole moments to the scattering cross-section is discussed by Mie theory. The simulated total scattering cross-section mainly contributed by electric dipole moments is in good agreement with the experimental spectra. We also found that the inner surface charge of gold shells changes significantly at different wavelengths of linearly polarized light as well as at different circularly polarized light. The asymmetric trimer with a core–shell structure has a more significant chiral response than the gold trimer. Meanwhile, there is a significant electric field enhancement at the slit between particles. This is especially useful for surface-enhanced Raman spectroscopy and the detection of trace chiral molecules.

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Data Availability

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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Funding

This research was supported by the National Natural Science Foundation of China (NSFC) (Grant No. 12074054, 12274054).

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Author notes

  1. Jiayi Liu and Rong Yan are contributed equally to this work.

Authors and Affiliations

  1. School of Physics, Dalian University of Technology, Dalian, 116024, People’s Republic of China

    Jiayi Liu, Rong Yan, Nan Gao, Yongqi Chen & Yurui Fang

  2. **angfen Senior Middle School, Linfen, 041500, People’s Republic of China

    Rong Yan

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  1. Jiayi Liu
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Contributions

Y.F. directed the project. J.L. did the simulations and analyzed the simulation data. R.Y. did the experiment and analyzed the experimental data. N.G. and Y.C. discussed the results and analysis. J.L. and R.Y. wrote the manuscript. All of the authors revised the manuscript.

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Correspondence to Yurui Fang.

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Liu, J., Yan, R., Gao, N. et al. The Multipolar Contribution and Plasmon Hybridization in Core–Shell Clusters. Plasmonics (2024). https://doi.org/10.1007/s11468-023-02186-0

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