Tunable Photonic Crystal And Metal Surface Periodic Structure Super Transmission Of Several Theoretical Issues

This thesis consists mainly of two parts: the mechanism of extraordinary transmission through two-dimensional periodic array of apertures perforated on the metal film(chapter 3); the theoretical study of tunable photonic crystals(chapter 4).In chapter 1, we give introductions of photonic crystals, surface plasmon, extraordinary transmission, and cavity resonance, the most important of which is the resonance inside the slit when the width of the slit is very small in comparison to the wavelength of incident light. Cavity resonance may be the key to understand the extraordinary transmission of array of rectangular holes or coaxial holes.In the first section of chapter 2,1 detail some selected topics on FDTD method. In the second section, transfer matrix method is detailed.In chapter 3 the mechanism of extraordinary transmission through metal film perforated by periodic arrays of apertures is discussed. We believe that for arrays of circular holes the mechanism is the surface plasmon polaritons induced by periodicity on the metal surface and the coupling between the front surface and the back surface. However for rectangular holes or coaxial holes, local resonance inside the cavity is predominant.In chapter 4, tunability of photonic crystals is studied when external magnetic field is applied along the normal to the interface. Either photonic bandgap or Brewster angle can be tuned.