Photonic band structures 4 Amplification effects 2 Anomalous dispersion 2 Artificial opals 2 Band structure 2 Close-packed planes 2 Crystalline structure 2 Crystallization 2 Face centered cubic lattice 2 Group velocity reduction 2 Harmonic generation 2 Interparticle distances 2 Light 2 Light velocity 2 Microspheres 2 Models, Statistical 2 Models, Theoretical 2 Nonlinear materials 2 Nonlinear optics 2 Normal direction 2 Opal films 2 Optical analysis 2 Optical response 2 Optics and Photonics 2 Photonic crystals 2 Photonic structure 2 Photons 2 Polystyrene spheres 2 Polystyrenes 2 Scattering, Radiation 2