4.4 Article

Discrete Talbot effect in modulated lattices with PT symmetric perturbations

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Optica Publishing Group
DOI: 10.1364/JOSAB.484961

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We demonstrate the effective realization of the periodic self-imaging phenomenon in a three-layered optical lattice with parity-time symmetric modulations, using theoretical and numerical methods. The Talbot distance and effect can be engineered by varying coupling coefficients and adjusting the modulation phase.
We demonstrate both theoretically and numerically that the periodic self-imaging phenomenon of light patterns with certain input periods can be effectively realized in a three-layered optical lattice with parity-time symmetric modulations, which can introduce a modulation phase to the lattice structure. By varying the ratio of coupling coef-ficients, the Talbot distance can be engineered, which can be further tuned by adjusting the modulation phase. The Talbot effect occurs only if the modulation phase belongs to a specific set: {+/-pi/3, +/-pi /2, +/- 2 pi /3, +/-pi}. (c) 2023 Optica Publishing Group

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