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We report on a direct experimental observation of dynamic localization (DL) of light in sinusoidally-curved lithium-niobate waveguide arrays which provides the optical analog of DL for electrons in periodic potentials subjected to ac electric fields as originally proposed by Dunlap and Kenkre Phys. Rev. B 34, 3625 (1986)10.1103/PhysRevB.34.3625. The theoretical condition for DL in a sinusoidal field is experimentally demonstrated.
Longhi et al. (Wed,) studied this question.