基于时域有限差分方法的时变等离子体传播特性

发布时间：2018-11-05 12:23

【摘要】：基于辅助微分方程的时域有限差分法对太赫兹波在时变等离子体中的麦克斯韦方程进行推导,利用本构关系建立了含有尘埃颗粒的时变等离子体模型,模拟了随时间变化的尘埃等离子体鞘的吸收系数,反射系数和传输系数.数值计算结果表明:电子密度的增长速度受上升时间的影响,导致等离子板的反射系数随上升时间的增加而减小.吸收系数的增加与减少上升时间和频率、增加电子密度和尘埃粒子密度有关;等离子板的厚度、尘埃粒子密度,电子密度与吸收系数成正比,当波的工作频率高达1 500GHz时,只有电子密度小于10~(20) m~(-3)才可以通过等离子板,等离子板的反射系数几乎不受碰撞频率小于3.5×1011 rad/s的影响.
[Abstract]:The Maxwell equation of terahertz wave in time-varying plasma is derived by finite-difference time-domain method based on auxiliary differential equation, and the time-varying plasma model with dust particles is established by using constitutive relation. The absorption coefficient, reflection coefficient and transmission coefficient of dust plasma sheath varying with time are simulated. The numerical results show that the increasing rate of electron density is affected by the rising time, which leads to the decrease of the reflection coefficient of the plasma plate with the increase of the rising time. The increase of absorption coefficient is related to decreasing rising time and frequency, increasing electron density and dust particle density. The thickness of the plasma plate, dust particle density, electron density are proportional to the absorption coefficient. When the frequency of the wave is as high as 1 500GHz, only when the electron density is less than 10 ~ (20) m ~ (-3) can the plasma plate pass through the plasma plate. The reflection coefficient of the plasma plate is almost independent of the collision frequency of less than 3. 5 脳 1011 rad/s.
【作者单位】：安徽大学电子信息工程学院计算智能与信号处理实验室;
【基金】：国家自然科学基金(Nos.61701001,61722101,61701003,61601166) 安徽省自然科学基金(Nos.KJ2015A202,1508085JGD03,1508085QF130)资助~~
【分类号】：O53

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