FDTD dispersion revisited: faster-than-light propagation
FDTD dispersion revisited: faster-than-light propagation
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DOI：
10.1109/75.755044
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发表时间：
1999-02
期刊：
影响因子：
--
通讯作者：
J. Schneider;C. L. Wagner
中科院分区：
文献类型：
--
作者：
J. Schneider;C. L. Wagner
The numerical dispersion relation that governs the propagation of fields in a finite-difference time-domain (FDTD) grid was derived several years ago. In this work a different interpretation is given for the governing equation. It is shown that the dispersion relation predicts faster-than-light propagation for coarsely resolved fields. Additionally, some spectral components that were previously believed to have zero phase velocity are shown to propagate, albeit with exponential decay.
