Please help on "Group velocity."

Hassan Aghababaeian <[email protected]>
Newsgroups gmane.comp.science.photonic-bands
Message-ID <[email protected]>
Hi,
 
I need to study the effect of the geometry on group velocity of the light in 2D photonic crystals.
the manual of group velocity function  is not compelete (or I need more detail about input and output of this function.)
 
any help?
Regards

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