Re: How can I calculate of group velocity of guided mode?
"Steven G. Johnson" <[email protected]>
| Newsgroups | gmane.comp.science.photonic-bands |
|---|---|
| Message-ID | <[email protected]> |
On Mar 2, 2009, at 9:04 PM, Hassan Aghababaeian wrote: > I need to calculate group velocity of guided mode (or Group index) > in some geometry like line defects. > From froum I understood display-group-velocities command in MPB can > be useful. But I couldn't find what is output and how can be used? > When I extract Group velocities by: grep velocity *.out > > result.dat, the output is some vectores like: > velocity:, 1, #(0.0 0.0 0.0), #(… > velocity:, 2, #(0.546472273423393 0.31550526440082 > 7.60657916462197e-9), … > > What do these vectors mean? How can I calculate group velocity of > guided mode? As documented in the manual, they are the group velocities, in units of c, in Cartesian coordinates, one line per k-point and one velocity per band (comma separated). That is, the format is #(vx/c vy/c vz/c). #(.....) is the Scheme way of printing any objects of the Scheme "vector" type. Stevne _______________________________________________ mpb-discuss mailing list [email protected] http://ab-initio.mit.edu/cgi-bin/mailman/listinfo/mpb-discuss