Abstract
In this paper, theoretical calculations based on dipole-limit are performed to investigate the effects of curvature on the surface plasmon resonance (SPR) properties of nanometer size gold spheroid and shell. By comparing the aspect ratio with the shell thickness, we demonstrated that the curvature radius is a common better factor that can be used to predict the SPR wavelength and shift fashion. For nanospheroid, increasing the ratio of curvature radius corresponding to the climaxes leads to an increase in the ratio of SPR wavelength, whereas increasing the ratio of curvature radius of outer and inner surface in nanoshell leads to an decrease in the ratio of SPR wavelength. As a morphologic factor, curvature radius plays an important role in affecting the distribution of electron density, and consequently controlling the SPR frequency.
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This work was supported by the Natural Science Basic Research Plan in Shaanxi Province of China (Program No. 2005A20) and “985 Project” Research Bases in Xi’an Jiaotong University.
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Zhu, J. Calculation of curvature dependent surface plasmon resonance in gold nanospheroid and nanoshell. J Nanopart Res 11, 785–792 (2009). https://doi.org/10.1007/s11051-008-9436-6
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DOI: https://doi.org/10.1007/s11051-008-9436-6