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Translight software (freeware) from the university of glasgow might be able to help initially. It has templates for certain pbg structures so that can be a good starting point.
To my knowledge, there are no simple design rules for photonic crystals, except that it is not simple to design, and even more difficult to fabricate. Photonic crystals are a 3D extension of the better known distributed Bragg reflectors. So the crystals need a periodic structure, to reflect light. However, it is not simple to make a structure that reflects light for all possible incidence directions and wavelengths.
A good open-source tool for 2D photonics crytals (and maybe even 3D, I haven't checked the latest version) is at http://camfr.sourceforge.net/
The MIT Photonic bands package (MPB)- see **broken link removed** is on unix, but it can be installed on windows too (i did it, using cygwin).
This program is useful for gettintg the band diagram of an arbitrary photonic crystal.
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