Analysis On Em Scattering Of Photonic Crystal Based On Fdtd Method

Following optical fiber and fibre-optic communication, periodic medium and structure in the theory of modern microwave and electromagnetic (EM) field have also drawn great attention, about which the two outstanding achievements recently are photonic crystal and left-handed material. The concept of photonic crystals was first proposed in optical field and has a great development in the field of optoelectronics, the most potential applications of which is the visible and infrared bands of the three-dimensional complete photonic band gap crystals. The initial three-dimensional photonic crystals are the space periodic structure which is consisted of two kinds of media box. In this paper, finite difference time domain method is used to analyze EM scattering of the photonic crystal under visible light irradiation.The paper includes the following points:(1) The simulation on two-dimensional photonic crystals is proceed by time-domain finite-difference methods, and give the result of the time-harmonic field distribution, phase distribution and field-strength situation;(2) Combined extend planar technology with periodic boundary, the simulation of their two-dimensional characteristics of the radar cross section is investigated in natural light.The scattering characteristics of loss media is verified by contrasted with that of the lossless, which provide a basis for the stealth technology. photonic crystals exposed to different wavelengths of light waves, numerical results is gained,which is combined with the experiment result, optimization model is obtained;(3) A preliminary exploration of Three-dimensional photonic crystal structure model is shown using the FDTD method, which gives the feasibility program.Through the analysis of photonic crystal, using its features, optimizing the dielectric structure, new materials can be design more accurately to meet the actual demand.