Hello,
I was following the tutorial of OptiFDTD to plot the dispersion diagram of 2D defect line PBG structure(super cell 5×5, the line in the middle is removed as a defect line.), and the result is attached as file 2.
I was expecting to get a clear defect-mode line inside the bandgap region which is similar to the plot shown in file 1. However, I failed to get so plot no matter what I did with OptiFDTD. Please help me to figure out what the problem is.
Thank you very much!
Kai.
.