Huygens subgrid technique for FDTD analysis of plasma problems

In this paper, one kind of subgrid techniques using physical connection between the main grid and subgrid is proposed. The physical space is composed of two fictitious spaces by equivalent principle. More details and accurate results in critical areas of interest are obtained by Huygens method replacing the wave equation on the interface of main grid and subgrid. Following physical principles rigorously, there is no significant reflection from the grids connection. Numerical simulation of electromagnetic wave propagation in plasma is implemented.