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Improve the Effective Resonance Light Scattering of Three-Layered Plasmonic Au@Dielectric@Ag Bimetallic Nanoshells

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Abstract

The strong light scattering from SPR has received an extraordinary attention due to the useful applications in photodetectors and cell and biomedical imaging. However, the applications using light scattering require a high scattering cross-section along with low absorption losses near the resonance wavelength. In this paper, effective plasmonic scattering of three-layered Au–Ag bimetallic nanoshells with a dielectric separate layer has been studied using the quasi-static approximation of classical electrodynamics. Because of the surface plasmon resonance (SPR)-induced intense light absorption, the effective scattering intensity is much weaker than that of scattering cross-section. However, the effective scattering intensity could be improved by tuning the geometric dimension and local dielectric environment of the nanostructure. It has been found that the greatest effective scattering takes place when the outer Ag nanoshell has a thick thickness or the dielectric separate layer has a small dielectric constant. The effective scattering also depends on the inner Au sphere radius and outer surrounding dielectric constant. Because of the mode transformation of the SPR, the effective scattering could also be greatly improved when the inner Au sphere has a very small or large size. However, the effective scattering intensity changes non-monotonously as the surrounding dielectric constant increases. The greatest effective scattering could be obtained when the surrounding dielectric constant has an intermediate value. This tunable effective plasmonic scattering of Au@Ag three-layered nanoshells presents a potential for design and fabrication of plasmonic optical nanodevice based on resonance light scattering.

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Funding

This work was supported by the National Natural Science Foundation of China under Grant No. 11774283 (recipient: Jian Zhu).

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Authors and Affiliations

  1. The Key Laboratory of Biomedical Information Engineering of Ministry of Education, School of Life Science and Technology, Xi’an Jiaotong University, Xi’an, 710049, China

    Jian Zhu

  2. Non-Equilibrium Condensed Matter and Quantum Engineering Laboratory, School of Science, Xi’an Jiaotong University, Xi’an, 710049, China

    Shu-min Zhao

Authors
  1. Jian Zhu
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  2. Shu-min Zhao
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Contributions

Jian Zhu: writing—reviewing and editing, investigation, project administration, funding acquisition. Shu-min Zhao: data curation, investigation, writing—original draft preparation.

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Correspondence to Jian Zhu.

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The work described has not been published before. The work is not under consideration for publication elsewhere. Its publication has been approved by all co-authors. Its publication has been approved by the responsible authorities at the institution where the work is carried out.

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The authors declare no competing interests.

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Zhu, J., Zhao, Sm. Improve the Effective Resonance Light Scattering of Three-Layered Plasmonic Au@Dielectric@Ag Bimetallic Nanoshells. Plasmonics 17, 173–180 (2022). https://doi.org/10.1007/s11468-021-01510-w

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  • DOI: https://doi.org/10.1007/s11468-021-01510-w

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