Research On Negative Refraction Materials And Photonic Crystal

Many people think that the next generation carrier of information be photonic. Photonic has more resources than electron can be used, such as amplitude, phase, frequency, and polarization. Photonic crystal is the very kind of material that can control photonic behavior. Because photonic crystals are artificial crystals, it is our studying issue to design and fabricate the photonic crystals. Many accurate numerical calculations could be performed thanks to the development of computing facilities. These calculations were really useful for the design of the photonic crystal structures. As for the experiment studies, many researchers in various fields have been collaborating to make new photonic crystals and measure their properties. Left-handed material (LHM) is a new kind of artificial material, which has many special characters, such as negative refraction, amplification of evanescent wave, sub wavelength resolution. The purpose of this paper is to study the electromagnetism characters of this two materials.The main contribution of this paper is as following:Firstly, optical amplification from 1-D photonic crystal fibers (PCFs) with layered structure composed of positive and negative refraction materials is studied with FDTD method. The unusual properties of these PCFs suggest a possibility of diverse applications to the super dense wavelength-division multiplexed communication systems, such as optical signal transmission and optical amplification.Secondly, explored 2-D PC structure of negative refraction effect and super-lens effect and physics mechanism of these .These help us designing and producing all kinds of useful effective media.Thirdly, by altering the lattice radius ,lattice period and ply ,the changes of the band gap of two - dimensional photonic crystals of InP - InGaAsP heterostructure are simulated and the rule of change is analyzed.Fourthly, studied on the optical gain of photonic crystals with active impurity, and found that doped PCFs can find wide application in Dense Wavelength Division Multiplexing (DWDM) of optical amplification communication systems which can greatly increase the capacity of the transmission information and the transmission distance.