Theory of photon bands in three-dimensional periodic dielectric structures
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Recent experiments have found the existence of ''photon bands'' in periodic dielectric structures analogous to the electron bands in the solid. Using a plane-waves method, we study in the scalar-wave approximation the nature of the photon bands in structures where spherical ''atoms'' of dielectric constant εa are periodically arranged in a background dielectric εb. The scalar-wave calculation predicts gaps in the spectrum for εa/εb or εb/εa≳3 or so. The nature and symmetry of the wave functions is also discussed.