Abstract
The polarization properties of the local electric field in the gold–dielectric–gold multilayer nanoshells are investigated by theoretical calculation based on the quasi-static approximation. The calculation results show that the complete polarized incident light does not only stimulate the same directional polarized local electric field. The polarized angle of the local field may changes from 0° to 90° as the wavelength and location are changed. The distributions of local field polarization are different in dielectric layer or gold shell and display different features in different plasmonic hybridization mode. As the incident wavelength is increased, the hot spot of polarizing angle moves monotonously in the middle dielectric shell, whereas moves nonmonotonously in the gold shell and surrounding environment. In the gold shell, the gap between hot spots of polarizing angle may occur at the resonance frequency. However, the hot spots of polarizing angle always occur at the resonance frequencies in the surrounding environment. These interesting results show that the single-molecule detection based on metal nanostructure induced surface-enhanced Raman scattering and surface enhanced fluorescence could be optimized by adjusting the incident light polarization and frequency.
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Acknowledgments
This work was supported by the Program for New Century Excellent Talents in University under Grant No. NCET-10-0688 and the Fundamental Research Funds for the Central Universities, and the National Natural Science Foundation of China under grant no. 11174232, 61178075, and 81101122.
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Zhu, J., Li, JJ. & Zhao, JW. Frequency-Dependent Polarization Properties of Local Electric Field in Gold–Dielectric Multi-Nanoshells. Plasmonics 8, 417–424 (2013). https://doi.org/10.1007/s11468-012-9406-9
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DOI: https://doi.org/10.1007/s11468-012-9406-9