The Periodic Structure Of The Surface Plasmon Resonance Properties

Surface plasmon polaritons are a state of evanescent wave, which are localized on the surface of a metal by the interaction of free-electrons and photons. The surface plasmon polaritons have some advantages such as subwavelength nature, high field intensity and low dimensionality, thus it has tremendous potential applications in building nano-photonic devices, integrated optoelectronic chips in the future. The properties of surface plasmon polaritons are of considerable importance in both theoretic research and applied science, and now it is a footstone of plasmonics, which is an emerging branch of photonics. We're also trying to do some fundamental works to explain the properties of Surface plasmon polaritons propagating on the periodic structures.In this thesis, using the finite difference time domain method, we investigated the optical properties of a periodic array of strongly coupled gold nanoparticles. We show the two kinds properties of transmission spectra with both different interparticle spaces and different radii of the particles. It is found that some distinct extra resonance peaks appear in the forbidden band gap and the resonance frequency depends strongly on the space between the particles and the radius of the particles. Based on the localized nature of the field distribution, we also show clearly the presence of local plasmons resonant modes that originate from quadrupole plasmon polaritons.Also, using the finite difference time domain, we numerically study the properties of planar defect structures, which are created by changing,moving,removing a specific plane of the periodic array of metallic nanoparticles. It is shown that the plasmon resonance mode can be controlled by introducing the planar defect. Besides, the peak value and the width of the defect mode depend strongly on the defect distance.We investigated theoretically the optical properties and the plasmonic interactions of a metallic nanotubes array outside a thin metallic film. We show that the energies and intensities of the plasmon resonances depend strongly on the aspect radio of the nanotube (the radio of the inner to outer radii), the separation between the center of the nanotube and the upper surface of the metallic film and the thickness of the film. In the thin film, the high-energy localized tube-related plasmons can induce their images on both sides of the metallic film, so the degeneracy state split into two modes.