| Summary: | 碩士 === 國立臺灣大學 === 光電工程學研究所 === 95 === The optical properties of metal nanoparticles have long been of interest for scientists, beginning with Faraday’s investigations of colloidal gold in the middle 1800s. Recently, new lithographic techniques as well as improvements to classical wet chemistry methods have made it possible to synthesize noble metal nanoparticles with a wide range size, shapes and dielectric environments. In this thesis, we investigate the theory and simulation of plasmon resonances of interacting silver nanoparticles by employing the finite-difference time-domain method and Drude model. Discussion of the analytical and numerical methods for calculating total scattering cross section is included in this thesis; in addition, optical properties for various parameters are analyzed, such as different radius, separation distance and incident direction. While individual particle exhibit a single plasmon resonance, we observe a complex spectrum of resonances for interacting structures. It is found that the number and magnitude of the different resonances depend on the illumination angle and on the distance between the particles.
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