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介绍了色散介质的移位算子时域有限差分方法(SO-FDTD).通过将色散介质的介电常数写成有理分式函数形式,推导出时域中电位移矢量D和电场强度E之间的关系,将此方法应用于计算电磁波在均匀非磁化等离子体中的传播.与ZT-FDTD方法计算的结果相比,SO-FDTD方法的计算精度得到了证实,数值结果进一步显示出这一算法计算效率高,消耗的计算机资源少.
The time-domain finite difference method (SO-FDTD) of shift operators for dispersive media is introduced. By writing the permittivity of dispersive media into a rational fractional function, the time-domain electric displacement vector D and electric field intensity E are derived , The method is applied to calculate the propagation of electromagnetic wave in a uniform non-magnetized plasma.Compared with the results calculated by ZT-FDTD method, the computational accuracy of SO-FDTD method is verified, and the numerical results further show that this algorithm High computational efficiency, consume less computer resources.