Thank you, Prof. Steven! I just tried to compute band gap diagram for 2d periodical structure, with nonlinear layers and then I want to compare this result with the results from the nonlinear Shroedinger equations. So I want to see how the cut-off frequencies changes with the amplitude gets larger. BTW this method (run-k-points) works when the nonlinear additive to the refraction index is not big enough of course! Thank you for your opinion, Prof. Steven. I'll try to study this problem more closely, because some strange things start to occur with some amplitude value, I want to say that if the amplitude gets the value 3.5 (some definite value) I see at the dispersion diagram 2 branches instead of one (I tried to publish image on http://imagepaste.nullnetwork.net/viewimage.php?id=1428)
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