Abstract
A model system of metal nanocomposite structures separated by dielectric layers has been developed to reveal the impact of the dielectric matching layer on surface plasmon resonance (SPR) in multilayer structures. The research results indicate that SPR is highly sensitive to the dielectric constant and interface thickness of the dielectric layer. The dielectric constant and thickness of the dielectric layer together determine the propagation characteristics of the electromagnetic wave within the medium. The thickness of the dielectric layer affects the propagation distance of the electromagnetic field within the layer, while the dielectric constant regulates the speed and extent of the medium’s response to changes in the electric field. In this study, when the dielectric layer thickness is less than 30 nm, localized surface plasmons and propagating surface plasmons can couple between gold nanoparticles and gold films, with the coupling effect being more pronounced when the dielectric layer thickness is between 10 and 20 nm. Conversely, when the dielectric layer thickness exceeds 30 nm, the electromagnetic field is effectively isolated, hindering the coupling effect, with the localized surface plasmon resonance becoming the primary mechanism. Within the illumination range of 400 to 1200 nm, the dielectric constant within the range of 1.4 to 3.8 exhibits an approximately linear relationship with the wavelength of the absorption peak, with electric field intensity reaching its maximum when the dielectric constant is close to 2.6. Therefore, in the design and optimization of optical devices, precise control of the plasmon resonance modes can be achieved by systematically adjusting the thickness and dielectric constant of the dielectric layer.
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This research was supported by the Natural Science Foundation of Zhejiang Province under grant number LY21F010010.
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The author contributions in the manuscript are as follows: Jing Jin and Xudong Cheng wrote the main draft. Yun Zhou, Zhicheng Dong, and Zhenyu Xue participated in the writing of the results and discussion sections. All authors reviewed their manuscript prior to submission.
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Jin, J., Cheng, X., Zhou, Y. et al. Tunable Surface Plasmon Resonance in Metal-Dielectric Multilayer Structures. Plasmonics (2024). https://doi.org/10.1007/s11468-024-02344-y
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DOI: https://doi.org/10.1007/s11468-024-02344-y