We investigated the Talbot effect in an anti-parity-time(PT)symmetric synthetic photonic lattice composed of two coupled fiber loops.We calculated the band structures and found that with an increase in the gain-loss p...We investigated the Talbot effect in an anti-parity-time(PT)symmetric synthetic photonic lattice composed of two coupled fiber loops.We calculated the band structures and found that with an increase in the gain-loss parameter,the band transitions from a real spectrum to a complex spectrum.We study the influence of phase in the Hermitian operator on the Talbot effect,and the Talbot effect disappears when the period of the input field is N>8.Further study shows that the variation of Talbot distance can also be modulated by non-Hermitian coefficients of gain and loss.This work may find significant applications in pulse repetition-rate multiplication,temporal invisibility,and tunable intensity amplifiers.展开更多
Self-healing in optics generally refers to the ability to reconstruct itself and restore the original state after encountering obstacles in the propagation of the light field.In this research,we observe the processes ...Self-healing in optics generally refers to the ability to reconstruct itself and restore the original state after encountering obstacles in the propagation of the light field.In this research,we observe the processes of the wave fields from perfect to defect in front of the focal plane of the 4f system,finally returning to an intact situation after the plane.According to simulations and experimental results,there is a minimum self-healing distance for the moirélattice field that positively associates with the radius of the defect[obstacle]in the nondiffracting transmission range.Furthermore,it is observed that the defect self-healing is a process of“repairing the center and then repairing the edges.”These findings can be applied in areas such as optical imaging,capture,and information processing.展开更多
基金supported by the National Key Research and Development Program of China(Nos.2022YFA1404800 and 2019YFA0705000)the National Natural Science Foundation of China(Nos.12104272,12274270,91950104,12192254,92250304,and 11974218)the Local Science and Technology Development Project of the Central Government(No.YDZX20203700001766)。
文摘We investigated the Talbot effect in an anti-parity-time(PT)symmetric synthetic photonic lattice composed of two coupled fiber loops.We calculated the band structures and found that with an increase in the gain-loss parameter,the band transitions from a real spectrum to a complex spectrum.We study the influence of phase in the Hermitian operator on the Talbot effect,and the Talbot effect disappears when the period of the input field is N>8.Further study shows that the variation of Talbot distance can also be modulated by non-Hermitian coefficients of gain and loss.This work may find significant applications in pulse repetition-rate multiplication,temporal invisibility,and tunable intensity amplifiers.
基金supported by the National Key Research and Development Program of China(No.2019YFA0705000)the National Natural Science Foundation of China(NSFC)(Nos.12104272,12192254,91750201,and 11974218)+1 种基金the Innovation Group of Jinan(No.2018GXRC010)the Local Science and Technology Development Project of the Central Government(No.YDZX20203700001766)。
文摘Self-healing in optics generally refers to the ability to reconstruct itself and restore the original state after encountering obstacles in the propagation of the light field.In this research,we observe the processes of the wave fields from perfect to defect in front of the focal plane of the 4f system,finally returning to an intact situation after the plane.According to simulations and experimental results,there is a minimum self-healing distance for the moirélattice field that positively associates with the radius of the defect[obstacle]in the nondiffracting transmission range.Furthermore,it is observed that the defect self-healing is a process of“repairing the center and then repairing the edges.”These findings can be applied in areas such as optical imaging,capture,and information processing.
