books.google.com.au - Since it was first published in 1995, Photonic Crystals has remained the definitive text for both undergraduates and researchers on photonic band-gap materials and their use in controlling the propagation of light. This newly expanded and revised edition covers the latest developments in the field, providing...http://books.google.com.au/books/about/Photonic_Crystals.html?id=owhE36qiTP8C&q=perturbation&utm_source=gb-gplus-sharePhotonic Crystals
