I am working on normal stripe waveguide , and want to find out the single mode condition. the method explained in given linkhttps://kx.lumerical.com/t/sweep-to-obtain-geometry-with-number-of-modes/975 is for mode solution , where as I am using FDTD solution. Is there a way to extract neff from the source object using scripting and doing something similar as explained in above reference.
Yes, you can.
n = getresult("source","neff");
Please take a look at this page for more info:
I hope this answered your question.