Hello dear Steven and meep users i felt a good experience for calculation of band structure for nondispersive square photonic crysals and the results have good matching with those of PWE method. but my problem is with the dispersive and metal materials. i found that there is some difference in some range of frequencies. For example i tried to plot the results of FDTD mode extraction of a Ag 2D photonic crystal. when i compare it with the graph of a paper i see that all things are ok except of the frequencies around the poles of Lorentz-Drude model ,i have implemented for Silver metal, that there is no data for these parts of graph.
I admire if someone help me about this Sincerely yours Mehdi
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