Study On The Interaction Of Terhertz Wave Propagate In The Microplasma

Because of its unique properties,terahertz(THz)waves have great potential for application In aerospace,object imaging and detection,medical and health,mobile communications,environmental monitoring and other fields.In recent years,the world has been fruitful research in the field of terahertz science and technology,and achieved fruitful results.However,the lack of high sensitivity,fast response and relatively inexpensive rt THz wave probe is one of the major bottlenecks THz technology.In order to obtain a high-sensitivity THz wave detector at room temperature,the project team has developed a THz wave detector based on the interaction between plasma and THz wave.Using a microplasma instead of a plasma to detect THz waves,the detector will have a smaller detection volume and react more quickly.Therefore,the THz wave detector developed with the principle of interaction between microplasma and THz waves will have high sensitivity,economical,portable and so on.Therefore,this paper studies the interaction between terahertz wave and microplasma in terms of theory.First,select the appropriate fluid model in the kinetic model.From the Maxwell equations,the wave equation of micro-plasma discharge is established,the influence of the electrical effect of THz wave on the micro-plasma is considered,and the boundary conditions are determined.The model basis for the interaction between THz wave and microplasma is established.Secondly,using Comsol software to establish a one-dimensional micro-plasma discharge model,by observing parameters such as electrode voltage,electrode spacing,microplasma thickness,and microplasma densit.When the voltage is 150V,the electrode spacing is 1mm,and the microplasma density is 108/m3,the electron density of the microplasma is high.At the same time,the electron temperature is about 2.5eV or 39000K.The electron temperature of Dalian Institute of Technology is about 1eV?3.5eV,and the result obtained by the Chinese Academy of Sciences is less than 10eV.Comparing with other conditions,it can be considered that the discharge under this condition is more thorough and stable,which lays the foundation for selecting the appropriate discharge conditions.Finally,a two-dimensional model was built using Comsol software to characterize the response of the THz wave incident to the microplasma discharge region.In this paper,by changing the THz wave frequency,micro-plasma density,when the THz wave frequency is 0.1 THz,when the micro plasma density is 108/m3,the THz wave in the model is transparent.Higher rate,less loss,THz wave transmission is more stable.Combined with the one-dimensional simulation results,it can be considered that the microplasma discharge interval can detect the THz wave stably with high accuracy.This work lays a theoretical foundation for the development of a novel microplasma-based THz wave detector.