太赫兹波在大气压等离子体中的传输特性研究

项目名称： 太赫兹波在大气压等离子体中的传输特性研究

项目编号： No.61205093

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 信息四处

项目作者： 袁承勋

作者单位： 哈尔滨工业大学

项目金额： 28万元

中文摘要： 太赫兹（THz）技术被视为"21世纪新的前沿革命"，近十几年来，THz波的产生和探测技术快速发展，为其在各个领域的广泛应用提供了基础。其中利用THz波对等离子体进行诊断就是颇具前途的尝试。本文以大气压等离子体为研究对象，利用输出频率范围在0.3 - 7 THz之间的太赫兹激光器系统，研究THz波在大气压等离子体中的传输特性。通过分析THz波的吸收、反射、透射和相位变化特性，结合数值模拟结果，探究等离子体和THz波相互作用蕴含的非线性机理以及其它物理机理。利用实验测量的透射、相位变化等信息，通过理论推导，获取等离子体的电子密度分布、温度特征以及碰撞频率特征等信息，以期建立THz波诊断等离子体原理性系统，并分析THz波用于等离子体诊断的条件和适应范围。项目成果对于THz波高密度等离子体诊断、飞行器再入段的THz波通信以及THz波在深空探测中的应用，具有一定的指导意义。

中文关键词： 大气压等离子体；DBD等离子体；电弧等离子体；太赫兹波；

英文摘要： Terahertz (THz) technology is praised as the innovatied technology in 21 century. After more than 10 years development, the THz source and detector have gradually become maturity, and then "It is time to pave the way for the applications of THz waves." (The message that Nature Photonics took from the 2nd International Workshop on THz Technology, held in Osaka, Japan, from 30 Nov.-3 Dec. 2009.) Among the widespread uses，plasma diagnostic with THz waves, is just one of the new techniques with great promise. This proposal aims to the atmospheric pressure plasmas, and tries to use THz waves with the frequency 0.8-7 THz to irradiate the plasma. By analyzing the results of absorption, reflection, transmisson spectrum and the phase shift of the THz wave , combining the results of numerical simulation, the physical mechanisms,such as non-linear mechanism, will be potentially investigated.According to the data from experiment, the information of the plasma,such as electron density profile, temperature and collision frequency characteristics, has been presented. In addition, the system of plasma diagnostics with THz waves will be given, and its conditions and ranges of application would be analyzed. These results would be benefical to applications of THz waves in plasma diagnostics, communications in reentering of aerocr

英文关键词： Atmospheric Pressure Plasma；Dielectric Barrier Discharge(DBD) Plasma；Arc Plasma；Teraherzt Wave；