Hello everyone, Is it *necessarily* true that all the bands move to lower frequency values as the effective index of the photonic crystal is increased ? I thought this was, in general, true. But now I have some calculations that show otherwise, and am a little confused. I calculated the the first 8 bands of a 3D hexagonal lattice (from Gamma to A only) for different values of r/a, which means that the calculations were done for the same crystal with different filling fractions, or different effective refractive indices. The mean epsilon values were indicated in the output files.
For silica spheres in air background, the bands move up (down) as the average index decreases (increases), as expected. But for air spheres in polymer background, the opposite is observed. Any idea why that could be ? Thanks for any suggestions. Tushar -------------- ps: I'm very sure of the correctness of the ctl file since I have reproduced some previously published results with that. _______________________________________________ mpb-discuss mailing list [email protected] http://ab-initio.mit.edu/cgi-bin/mailman/listinfo/mpb-discuss
