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We show that defect modes (DMs) in optical lattices are possible in biased centrosymmetric photorefractive crystals. These DMs exist in different bandgaps due to the change of the defect strength. For a positive defect, DMs exist in each bandgap. The strongest confinement of DMs appears in the semi-infinite bandgap when the positive defect strength is fixed. For a negative defect, DMs exist in each...
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