How do I calculate group index or group velocity of photonic crystal waveguide using optifdtd?

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Hamed Alipour- Banaei

directly, you cant calculate group index or group velocity by optifdtd simulation tool. if you want calculate it directly, you can use RSOFT photonic CADsuite simulation software for it.

Amit Kumar Sharma

Thank you Hamed sir

i will use RSOFT tool ,then i will ask if find any difficulty.

all the best

Thank you Xiaochen sir

i am trying same