Abstract
The formation of photonic band structure by electromagnetic waves propagating in a periodic dielectric medium is discussed. The existence of a photonic gap at the Brillouin zone boundary is illustrated in the nearly-free-photon approximation. Numerical results obtained by solving the Maxwell's equations with the planewave method are presented for selected cases. For appropriate dielectric structures, a true photonic band-gap extending throughout the Brillouin zone can exist leading to the possibility of novel physical effects.
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