Crenshaw M, Sullivan K, Bowden C
Opt Express. 1997 Sep 15;1(6):152-9. doi: 10.1364/oe.1.000152.
We investigate local-field effects in nonlinear optical materials composed of two species of atoms. One species of atom is assumed to be near resonance with an applied field and is modeled as a two-level system while the other species of atom is assumed to be in the linear regime. If the near dipole-dipole interaction between two-level atoms is negligible, the usual local-field enhancement of the field is obtained. For the case in which near-dipole-dipole interactions are significant due to a high density of two-level atoms, local-field effects associated with the presence of a optically linear material component lead to local-field enhancement of the near dipole-dipole interaction, intrinsic cooperative decays, and coherence exchange processes.
我们研究了由两种原子组成的非线性光学材料中的局域场效应。假设一种原子与外加场接近共振，并被建模为二能级系统，而另一种原子则假设处于线性 regime。如果二能级原子之间的近偶极 - 偶极相互作用可忽略不计，则可获得通常的场的局域场增强。对于由于二能级原子的高密度而导致近偶极 - 偶极相互作用显著的情况，与光学线性材料成分的存在相关的局域场效应会导致近偶极 - 偶极相互作用的局域场增强、固有协同衰变以及相干交换过程。
