We investigate computationally the attenuation and reflection of Terahertz （THz） wave using targets coated with plasmas. The simulators are the Wentzel-Kramer-Brillouin （WKB） method and finite-difference timedomain （FDTD） method. The relation between the frequency of the incident electromagnetic （EM） wave and the attenuation caused by unmagnitized plasma is analyzed. The results demonstrate that the amount of absorbed power is a decreasing function of the EM wave frequency and the plasma collision frequency. For THz band incident wave, the attenuation that is caused by plasma is small when the plasma has common density and the collision frequency. This conclusion has fine applying foreground for plasma anti stealth.
采用磁化等离子体的分段线形电流密度卷积(Piecewise Linear Current Density Recursive Convolution,PLCDRC)时域有限差分(Finite-Different Time-Domain,FDTD)算法研究了一维时变磁化等离子体光子晶体的禁带特性。以高斯脉冲为激励源,用算法公式所得的电磁波透射系数来讨论了等离子体上升时间、密度、周期常数对其禁带特性的影响。结果表明,改变等离子体上升时间和密度可以实现对禁带的控制。
采用等温近似,用磁化等离子体的分段线形电流密度卷积(Piecewise Linear Current Density Recursive Convolution,PLCDRC)时域有限差分(Finite-differentce Time-domain,FDTD)算法研究了具有单一缺陷层的一维磁化等离子体光子晶体的缺陷模特性;以高斯脉冲为激励源,用算法公式计算所得的电磁波透射系数,讨论了温度和等离子体层密度对其缺陷模的影响。结果表明:改变温度和等离子体层密度可以获得不同的缺陷模。
