Theoretical Models for Photonic Crystals -- to Part I -- Models for Infinite Crystals -- Models for Finite Crystals -- Quasi-Crystals and Archimedean Tilings -- Specific Features of Metallic Structures -- Optical Properties of Photonic Crystals -- to Part II. The Many ‘Facets’ of Photonic Crystals -- Control of Electromagnetic Waves -- Refractive Properties -- Confinement of Light in Zero-D…