Dear Steven and meep users Recently I tried to use meep to do calculation on nonlinear. But I’m confused on the calculation of refractive index change caused by nonlinear. This note (http://ab-initio.mit.edu/wiki/index.php/Units_and_nonlinearity_in_Meep) gives some details about my question, but I didn’t understand. What I got from this note is follow. Firstly I set the chi3 in the ctl file ,so I can calculate the n2. In order to obtain the change of refractive index, I also need get the power going through the structure by using the meep-fields-flux-in-box function. My first question is which function should I use. What I tried is (flux-in-box dir box). Moreover ,my structure is a two-dimensional Photonic crystal(X direction is transmission direction, Y is transverse direction), and the direction of the function (flux-in-box dir box) is perpendicular to the box. Does it mean the direction dir is Z ? So I hope you can give me an example of calculating the nonlinear effect on refractive index, a ctl file is better if it is convenient.Thank you very much.
Yours Lin Wang
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