In optigrating software,When we define the parameters of the grating, we can see the Ind.Mod. option in the Grating Definition dialog box. And in the use guide, we can see the official definition:
Ind. Mod. In the Index Modulation box, you define the amplitude of the index modulation of the grating.
So i want to know how to calculate the index modulation(Ind.Mod), and how the index modulation affect the transmission spectrum.
Thank you all!
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