How can I calculate group index of one dimensional photonic crystal by using Rsof?

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Sebastian A Schulz

The group index is given by the slope of the band structure. You could always calculate dk/dw (w = omega) for the bands that you are interested in.

Alternatively I can suggest the free MIT Photonics Band software, it has an unbuild function for the group velocity calculation.

Bhuvneshwer Suthar

Yes, you are right the group index can be calculated using band structure. It is slope of band structure.