Dear Steven and MPB users, I was trying to obtain the EFS (Equi Frequency Surface) plot of 2D photonic crystal lattice by making use of the code as given by Steven Sir himself in one of the old archive posts : http://www.mail-archive.com/mpb-discuss@ab-initio.mit.edu/msg00409.html
It was very easy to obtain the EFS plot for square lattice by making use of: (wavevector-diagram (kgrid 0 0.5 0 0.5 20 20) TM 0) And then replicating it (by making use of replicate.m again defined in the same archive post) to obtain multiple Brillouin Zones in the final EFS plot. But how to do it for a hexagonal lattice ? What I tried is that I used the wavevector-diagram function to generate w values over a Kgrid spanning all the way from -2 to +2 along both x and y directions (I know it is waste of computational space by doing that but did it to remove the use of an additional function to replicate one quardant of Brillouin Zone) and then plotted it by making use of contour plot in Octave/Matlab. But by doing it I ended up in a skewed plot of hexagonal EFS which looks more like having a square symmetry ! I'm sure many would have done it correctly and I must be making some silly mistake here. If someone could provide some help in this it will be much appreciated. Thanking you in advance. Regards, manish IIT Delhi, India.
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