Cheng Jing, Zhou Jianying
State Key Laboratory of Optoelectronic Materials and Technologies, Zhongshan University, Guangzhou 510275, People's Republic of China.
Phys Rev E Stat Nonlin Soft Matter Phys. 2002 Sep;66(3 Pt 2B):036606. doi: 10.1103/PhysRevE.66.036606. Epub 2002 Sep 18.
Gap solitons can exist in a periodic refractive-index grating modified by periodic layers of near-resonant two-level systems. In this work, we include the effect of the density-dependent near-dipole-dipole (NDD) interaction in order to generalize this model. For certain values of the grating parameters, we find that the NDD interaction significantly modifies the frequency bands in which gap solitons can exist. The difference between the model with and without the NDD interaction is discussed. The stability of gap solitons is studied numerically.
间隙孤子可以存在于由近共振二能级系统的周期性层修改的周期性折射率光栅中。在这项工作中，我们考虑了密度依赖的近偶极-偶极（NDD）相互作用的影响，以便推广这个模型。对于光栅参数的某些值，我们发现NDD相互作用显著改变了间隙孤子能够存在的频带。讨论了有和没有NDD相互作用的模型之间的差异。通过数值研究了间隙孤子的稳定性。
