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Photonic band gap structures are periodic dielectric crystal that exhibit a photonic band gap analogous to the electric band gap present in semiconductor photon in the frequency range of the band gap are completely excluded so that atom within such material are unable to spontaneously absorb and re-emit light in this region. In this paper, the band gap properties of photonic crystal and their application in optical waveguide are considered application in communication system.
Photonic band gap, waveguide