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Nobel metal nanoparticles (NPs) are widely used in various applications including optical and biological sensors, biomedicine, photocatalysts, electronics, and photovoltaic cells. Optical properties of gold NPs are surveyed in this paper under the Surface Plasmon Resonance (SPR) effect, which increases the light absorption and scattering at the SPR wavelength. This SPR frequency depends on the various factors, including the shape and size of the particles. Here, the optical response of gold NPs with different shapes and sizes is investigated using the finite element method (FEM) with COMSOL Multiphysics. The results show that the bandwidth, amplitude, and SPR wavelength depend on the shape and dimensions of the NPs as well as the polarization of the incident light. The SPR wavelength changes from 515 nm to 760 nm for different shapes of the NPs. To study the size effects, the spherical NPs absorptions are determined for different NPs size. As the particle size increases, absorption per unit volume decreases, and the bandwidth increases.
 

واژه‌های کلیدی:  Gold Nanoparticles، Surface Plasmon Resonance، Absorption Cross Section، Scattering Cross Section، Shape Effect.

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