Numerical Simulation Of The Fcc In The Reflective Properties Of The Core-shell Model And The Quasicrystalline Structure

As a new-style artificial material, photonic crystals will facilitate the development and innovation of the photonics and information industry. The photonic band gap (PBG) of theoretically designed photonic crystals, one main character, has changed gradually from microwave to infrared range during the last decade. PBG in the IR/optical frequencies, which is the more applicable and important material, have also been researching zealously in the past years. The tremendous application foreground of photonic crystals has upsurged the research in fabricating periodic artificial structures in many famous labs all over the world, which has been a very important research direction in the field of photonic.Different from the usual targets, such as permittivity, filling ratio, period and the connectivity of the two mediums, the metal, being more dispersive medium, was introduced into the FCC structure. The Transfer Matrix method is used to study the reflectivity behavior in low frequency. Calculation shows the thickness of the metal and the angles of incidence have an important effect on the band position.To some extent, it is difficult to fabricate photonic crystals in labs, therefore, theoretical simulation plays an important part in the study of photonic. Both calculation and experiment contribute to the optimization and design new structures. The primary principle was discussed in the last part of the paper. The interference patterns of 2D quasicrystals and 3D composed periodic quasicrystals was numerically Simulated in the next part.The following are the main assignments finished:1. The light reflectance of opals which were coated with silver nanoparticle spheres was studied by transfer-matrix method in this paper. Simulation numerically and analysis to the results were carried out resorting to the modified effective medium theory of dipole approximation in low frequency regime.2. If we select the proper metallic layer of core-shell model, the resonance bands will change to high frequency range. Photonic crystals can illustrates a gradual blueshift with a small metallic layer increment, and the same to larger incidence angels for Bragg band gap. The second reflectance peak shows a sharp mutation when the angleθequals to 40°.and we can be suddenly enlightened by the Bragg theory and metal's dispersion.3. The principle of Holography lithography was discussed by the adjustment of optical parameters such as beam numbers, schemes, polarizations, and incident angles, and we can optimize the interference parameters to attain a high contrast distribution of intensity in three-dimensional space.4. Paying more attention to the 5 beams and 10 beams interference, the interference patterns of 2D quasicrystals and 3D composed periodic quasicrystals were numerically Simulated and viewed by C language and Open DX respectively.