What is dispersion?

My friends I need information about dispersion do you have any special paper about it i ahve the Tafloves book else then that do you have other resources about dispersion especially i need some simultion results of diepersion relations see you soon with best regards

See the links below for info on numerical dispersion in FDTD:

http://www.eecs.wsu.edu/~schneidj/jo.../disp-comp.pdf

http://www.eecs.wsu.edu/~schneidj/jo...apers/mrtd.pdf

http://www.ece.osu.edu/~teixeira/pdfpapers/ap02moss.pdf

http://www.hft.ei.tum.de/data/lit/94J-krumpholz2.pdf

http://faraday.ee.auth.gr/papers/Zygiridis2004b.pdf

Dispersion is when the group velocity changes with frequency. This is very pronounced in filters as you get near the transition frequency range. In optics it is caused by molecular resonances in the glass or other material.