太赫兹波在非均匀等离子体鞘层中的传播特性  

Propagation Characteristics of Terahertz Waves in Inhomogeneous Plasma Sheath

作　　者：张洁[1,2] 韩冰 赵善超 张国栋 Zhang Jie;Han Bing;Zhao Shanchao;Zhang Guodong(College of Physics and Electronic Engineering,North West Normal University,Lanzhou 730070,Gansu,China;Intelligent Information Technology and Application Engineering Research Center of Gansu Province,Lanzhou 730070,Gansu,China)

机构地区：[1]西北师范大学物理与电子工程学院,甘肃兰州730070 [2]甘肃省智能信息技术与应用工程研究中心,甘肃兰州730070

出　　处：《激光与光电子学进展》2022年第17期132-137,共6页Laser & Optoelectronics Progress

基　　金：甘肃省科技计划资助(20JR10RA080)。

摘　　要：当飞行器以超高速返回大气层时,飞行器表面的空气发生电离,形成严重阻碍地面与飞行器之间通信的等离子鞘层。针对再入飞行器表面的等离子鞘层的特性,建立了具有非均匀电子密度和非均匀电子碰撞频率的等离子鞘层模型。基于非均匀介质的等效波阻抗思想,探讨了太赫兹波在具有不同分布特性的等离子体鞘层中的传播规律,研究了左右两种极化方式的太赫兹波在等离子体鞘层中的传播特性受不同因素的影响。研究发现太赫兹波在等离子体鞘层中的相移特性主要受入射角影响,且与波所处的位置和波的频率有关,与波的极化方式无关,相移特性呈周期性变化。左右两种极化方式的太赫兹波的传播特性在低频范围内受相同因素影响的差异较大,随着传输频率的升高,两种极化方式的传播特性逐渐趋于一致。When an aircraft reenters the atmosphere at hypervelocity,a plasma sheath that can block communication with the ground is formed due to the air ionization on the vehicle surface.In this study,a plasma sheath model with the inhomogeneous electron density and electron collision frequency is established to investigate the plasma sheath characteristics on the surface of the reentry vehicle.The terahertz wave propagation in the plasma sheaths with different distribution characteristics is discussed based on the idea of the equivalent wave impedance in inhomogeneous media.The effects of different factors on the propagation characteristics of lefthanded and righthanded circularly polarized terahertz wave in the plasma sheath are studied.The results show a periodic phase shift of the terahertz wave in the plasma sheath,which is mainly affected by the incident angle.This periodicity has nothing to do with wave polarization but is related to wave position and frequency.The propagation characteristics of the two polarization modes of terahertz waves greatly differ under the same factors at low frequencies.The propagation characteristics of the two polarization modes gradually approach with the transmission frequency increase.

关 键 词：傅里叶光学与信号处理 太赫兹波 等离子体鞘层 黑障 传输特性 

分 类 号：O451[理学—无线电物理]