Research On Wave Interactions With Microplasmas By Z Transforms FDTD Method

The wave interactions with plasma have been studied by many papers, and thethoeretical basis is getting more and more completely. The basic interactionsbetween wave and plasma include absorption, reflection, transmission and vibration.Microplasma is nowdays hot scientific issuse because of its unique properties suchas stability and high density. Lack of simulation of microplasma, many researchesabout the interacitons between wave and microplasma focus on the simple analysisof experiment data and basic theory explaination. Therefore, this paper plans to useZ transforms FDTD to simulate the wave interactions with plasma, and improves thewave band up to THz range. The paper also studies the wave propagation propertiesin microplasma by Establishing some relevent models.According to the real life plasma, this paper makes a summary of some basicthoeretical models. A basic "sandwich" structrure is established for microplasma. Ztransforms FDTD is deduced to simulate the interactions. This paper proves thevalidity of this method and performs the simulation of interactions. The structureparameters of microplasma including the width, density and collision frequence areconsidered. During the research, we find that the structure of microplasma has a biginfluence on propagation properties, the high frequence wave can transmit, thereflection coefficient oscillates and there are some cut-off frequence during theabsorption coefficient. we study the Epstein distribution of microplasma. Comparingwith uniform microplasma, we find that there are lower reflection coefficient, highertransimition coefficient and lower absorption coefficient in Epstein distribution.During the research of sandwich microplasma, we find the sandwich border has theeffect of periodic modulation. The periodic structure of microplasma is studied, wefind that the choice of wave frequence is obvious.Different frequence waves have different propagation properties inmicroplasmas. It is demonstrated that different waves can be used as an effectivediagnostic tool for microplasmas, also the special microplasma can be effective toolsfor modulation devices to control waves.