Institute of Spectroscopy, Russian Academy of Sciences, Troitsk, Moscow Region, Russia.
Opt Lett. 2013 Jul 15;38(14):2600-3. doi: 10.1364/OL.38.002600.
I study vector solitons involving two incoherently coupled field components in periodic parity-time (PT)-symmetric optical lattices. The specific symmetry of the lattice imposes restrictions on the symmetry of available vector soliton states. While all configurations with asymmetric intensity distributions are prohibited, such lattices support multihump solitons with an equal number of "in-phase" or "out-of-phase" spots in two components, residing on neighboring lattice channels. In the focusing medium, only the solitons containing out-of-phase spots in at least one component can be stable, while in the defocusing medium stability is achieved for structures consisting of in-phase spots. Mixed-gap vector solitons with components emerging from different gaps in the lattice spectrum also exist and can be stable in the PT-symmetric lattice.
我研究了涉及两个非相干耦合场分量的矢量孤子在周期性宇称时间（PT）对称光学格子中的情况。格子的具体对称性对可用矢量孤子态的对称性施加了限制。虽然所有具有非对称强度分布的配置都被禁止，但这种格子支持多峰孤子，其在两个分量中有相同数量的“同相”或“异相”点，位于相邻的格子通道上。在聚焦介质中，只有在至少一个分量中包含异相点的孤子才可以稳定，而在散焦介质中，由同相点组成的结构可以稳定。具有从格子谱中不同间隙出现的分量的混合间隙矢量孤子也存在，并且可以在 PT 对称格子中稳定。
