| Surface plasmon is definition as the plasmon polaritons which is limited to conduction surface. Because of plasmon existed in the surface of the media-metal photonic crystal micro-structure can generate coupling resonance with the photons, the structures may be able to modulate EM modes. In this paper, the structure of grating and double over layer was stimulated and compared by using finite difference time domain method (FDTD). Transmission rate of relatively narrow slit one-dimensional transmission metal grating was calculated. The impact of transmission of metal layer thickness was discussed through combining with real-time field map of electric field component of resonance peak. Under the irradiation of 800nm plane wave, the field enhancement factor of two spherical gold nanoparticles and the triangular structure was calculated, magnification of the surface electromagnetic enhancement in the binding site is more than two orders and the effect of the shape on the surface plasmon field enhancement was analyzed. Transmission spectrum of gold nanoparticle arrays was calculated. It was found that there was a forbidden band gap between 700nm and 1300nm, some extra resonance peaks appeared in the forbidden band gap, and the dependencies between the size, spacing and the resonance frequency was also discussed. |
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