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The effect of number of unit cells of the fcc photonic crystals on the property of the band gaps was investigated experimentally. Fcc photonic crystals with different numbers of cells were fabricated by using recording materials of different thickness in holography. Their transmitted spectra of the band gaps were measured. A guiding rule was given: a photonic crystal which can be practically used should have 50 unit cells at least.
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Keywords:
- fcc structure /
- photonic band gaps /
- number of lattice
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