Numerical Study on the Behaviors of Localized Surface Plasmon Resonances of Au Nanoparticles
Date Issued
2010
Date
2010
Author(s)
Wu, Shuo-Yen
Abstract
In this thesis, the numerical results of overall absorption and
scattering cross sections and cross sections per metal volume of Au nanorod
(NRO), nanoring (NRI), and nanoshell (NS), based on the commonly used
localized surface plasmon (LSP) resonance modes, with various sizes and
aspect ratios (ARs) in the reasonable ranges, which are determined by the
practical fabrication capability and application wavelength ranges, are
compared. The results show that the overall absorption and scattering cross
sections of NRO are generally smaller than those of NRI and NS. However,
in terms of cross section per Au volume, those of NRO are the highest
among the three types of Au nanoparticle (NP), followed by NRI and then
NS. We also evaluate the effects of NP random orientation distribution in a
solution or tissue in practical applications. It is found that with random
orientation, the reduction range of extinction cross section depended on the
geometry symmetry property of the electron oscillation axis in the
concerned LSP resonance mode. Then, we designed an Au NRI to make the
resonance wavelengths of its symmetric dipole mode and axial dipole mode
the same by increasing the ring height. In such an Au NRI of a large ring height, the reduction ranges of scattering and absorption cross sections were
significantly decreased.
Subjects
Localized Surface Plasmon (LSP)
Au Nanoring
Au Nanorod
Au Nanoshell
Type
thesis
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