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Moladad Nikbakht

M. Nikbakht and M. H. Mahdieh
Optical Responses of Gold Nanoparticles Undergoing a Change to Cluster Aggregates and Laser Beam Characteristics Effect
خواص اپتیکی انبوهه های طلا
Abstract


The local field enhancement for fractal aggregate targets consisting of clusters of gold nanoparticles (NPs) placed over a metallic substrate is studied numerically. The field enhancement occurs when such targets are irradiated by polarized laser beam. Using the dipole−dipole approximation (DDA) and considering Fresnel relations, the spatial field distribution over the sample was calculated. The effects of the incident beam characteristics such as polarization, wavelength, and incident angle on the collective responses of cluster aggregates were investigated. The effect of target morphology characteristics was also studied. Numerical calculations indicate that, because of target morphological anisotropy and boundary conditions, there is an optimum value for cluster size which maximizes the averaged local field enhancement for the p-polarized incident beam.

 

 

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