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The Effect of Inserted Gold Nanosphere on the Second Harmonic Generation (SHG) Enhancement Factor of Three-Layered Dielectric-Gold Nanoshell

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Abstract

The tunable second harmonic generation (SHG) enhancement factor of gold-dielectric-gold three-layered nanoshells has been theoretically studied using the theory of quasi-static electrodynamics and plasmon hybridization. Because of the local surface plasmon resonance (LSPR)-induced local field effect, the SHG response corresponding to both fundamental frequency and second harmonic has been greatly enhanced. By changing the geometry parameters and local dielectric environment of the three-layered nanostructure, the intensity and shift of the SHG factor peaks could be fine tuned. As the radius of the inner gold sphere is increased, both the fundamental and the second harmonic SHG peaks from the anti-symmetric coupling between the outer bonding shell plasmon and the inner sphere plasmon decrease, whereas the SHG peaks from the symmetric coupling between the outer shell and the inner sphere get intense. These radius-dependent intensity changes of the SHG peaks also depend on the dielectric constant of the separate layer and outer surrounding. Thus, the number of SHG peak could be tuned from two to four. Furthermore, the wavelength gaps between the SHG peaks corresponding to anti-symmetric and symmetric coupling could be greatly reduced by increasing the thickness of the outer gold shell. Therefore, the nonmonotonous intensity change could be observed because of the switching of the SHG peaks. The corresponding physical origin has been illuminated by analyzing the plasmon hybridization and the polarization fields in the nanostructure.

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Acknowledgments

This work was supported by the Fundamental Research Funds for the Central Universities under grant no. xjj2016060 and the National Natural Science Foundation of China under grant no. 11174232.

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Authors and Affiliations

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

    Shu-min Zhao

  2. 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

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

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Zhao, Sm., Zhu, J. The Effect of Inserted Gold Nanosphere on the Second Harmonic Generation (SHG) Enhancement Factor of Three-Layered Dielectric-Gold Nanoshell. Plasmonics 12, 1153–1159 (2017). https://doi.org/10.1007/s11468-016-0370-7

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  • DOI: https://doi.org/10.1007/s11468-016-0370-7

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