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A Computational Study of the Giant Local Electric Field Enhancement in Al-Au-Ag Trimetallic Three-Layered Nanoshells

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Abstract

The surface plasmon resonance (SPR)-induced local field effect in Al-Au-Ag trimetallic three-layered nanoshells has been studied theoretically. Because of having three kinds of metal, three plasmonic bands have been observed in the absorption spectra and the local electric field factor spectra. The local electric field enhancement and the corresponding resonance wavelength for different plasmon coupling modes and spatial positions of the Al-Au-Ag nanoshells with various geometry dimensions are investigated to find the maximum local electric field enhancement. The calculation results indicate that the giant local electric field enhancement could be stimulated by the plasmon coupling in the middle Au shell or the outer Ag shell and could be optimized by increasing the Ag shell thickness and decreasing the Au shell thickness. What is more, the local electric field enhancement also nonmonotonously depends on the dielectric constant of the environment; the local electric field intensity will be weakened when the surrounding dielectric constant is too small or too large.

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Acknowledgments

This work was supported by the Fundamental Research Funds for the Central Universities under grant no. 2011jdgz17 and the National Natural Science Foundation of China under grant no. 11174232.

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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. Nonequilibrium Condensed Matter and Quantum Engineering Laboratory, School of Science, Xi’an Jiaotong University, Xi’an, 710049, China

    Shu-min Zhao

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  1. Jian Zhu
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  2. Shu-min Zhao
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Correspondence to Jian Zhu.

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Zhu, J., Zhao, Sm. A Computational Study of the Giant Local Electric Field Enhancement in Al-Au-Ag Trimetallic Three-Layered Nanoshells. Plasmonics 11, 659–667 (2016). https://doi.org/10.1007/s11468-015-0099-8

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  • DOI: https://doi.org/10.1007/s11468-015-0099-8

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