Written for undergraduate students and researchers, the second edition of Photonic Crystals: Molding the Flow of Light addresses photonic bandgap materials and their use in controlling the propagation of light. Covering current developments in the field, this illustrated 304-page volume includes new chapters on photonic crystal fibers and combined index and bandgap guiding. The authors demonstrate how the ability of the crystals to localize light can be applied in devices such as filters and splitters. Chapters have been expanded and revised to include many new 3-D photonic crystals, a tutorial on device design using temporal couple-mode theory, and discussions on diffraction and refraction at crystal interfaces. John D. Joannopoulos et al; Princeton University Press, Princeton, N.J., 2008; $75.