Study On Metallic Photonic Crystals And The Fabrication Of Devices

Photonic crystals are structures of periodic modulated dielectric constants. Theinhibition of spontaneous emission and photon localization properties make photoniccrystals limit and control the photons easily and effectively. The principle is that lightscattering and multiple interference in periodic dielectric structure induce photonicband gaps, making photons of certain frequencies unable to pass through the structure.Metallic photonic crystals are made of metal materials such as periodicmetal-columns arrays. Study on metallic photonic crystals plays an important role inreducing devices’ size and improving their performance, which is significant inapplications and integration of photonic devices. This paper, based on finite differencetime domain method, studies the band gaps of metallic photonic crystals and thefabrication of devices.1. The band structures of two-dimensional metallic photonic crystals of differentmaterials and lattices are analyzed and compared. Results indicate that the triangularlattice has a wider first band gap and a higher second band gap.2. Using PMMA as the background medium can induce the total internalreflection phenomenon on the surface of two-dimensional Cu photonic crystals, thusinhibit the leakage of electromagnetic waves. By calculating its band structures, wefind the existence of the third band gap that does not exist in metallic photoniccrystals with air as the background medium.3. The two-dimensional Ag photonic crystal waveguide is designed. Three kindsof two-dimensional90°bend waveguides’ transmission characters under TMpolarizations are investigated. The3dB bandwidth of the optimized structure reaches99nm and the transmission efficiency reaches98.2%with the testing wavelength. 4. By filling liquid crystals into the two-dimensional metallic photonic crystalwaveguide to make it tunable, we study the optical properties of this kind waveguide.