Moreover, zigzag sampling is
performed on electric and magnetic field in line with time
sequence during the calculation, and the time interval is half of
a time step during the sampling, so as to form explicit
difference equation after the dispersion of Maxwell’s curl
equations to perform iteration solution temporally. Therefore,
with the initial value of electromagnetic problem given, the
distribution of electromagnetic field at each time moment and
space can be obtained step by step using FDTD algorithm.