Anyone
For theory on photonic crystals, take a look at Lectures 7, 8, 12 and 14 here:
http://emlab.utep.edu/ee5390em21.htm
The most popular way to calculate photonic band diagrams is to use the plane wave expansion method. To learn this, see Lectures 18-20 here:
http://emlab.utep.edu/ee5390cem.htm
Last, I have put pretty much all of this in the following book chapter:
Raymond C. Rumpf "Engineering the Dispersion and Anisotropy of Periodic Electromagnetic Structures," Solid State Physics, Vol. 66, pp. 213-300, 2015.
I have developed this set of material for the complete novice. Hope it helps!!
This book will help you
Book Photonic Crystals: Molding The Flow of Light
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