SIZE DEPENDENCE OF χ(3) IN NONLOCAL OPTICAL MEDIA: FRENKEL EXCITONS IN A PERIODIC CHAIN
SIZE DEPENDENCE OF χ(3) IN NONLOCAL OPTICAL MEDIA: FRENKEL EXCITONS IN A PERIODIC CHAIN
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非局域光学介质中 χ(3) 的尺寸依赖性：周期链中的弗兰克尔激子
DOI：
10.1142/s0218199192000157
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发表时间：
1992
影响因子：
2.7
通讯作者：
Kikuo Cho
中科院分区：
文献类型：
--
作者：
H. Ishihara;Kikuo Cho
为了讨论受限电子系统三阶非线性极化率χ（3）的尺寸依赖性，本文给出了周期链中无相互作用Frenkel激子的精确可解模型的数值研究结果.在长波长近似下对泵浦-探测型非线性效应进行了处理，并将Im[χ（3）]作为链长N、转移能B和阻尼常数的函数进行了计算.对于给定的B（N）值，随着N（B）值的增加，χ（3）增加，随后是饱和行为。增强的范围由阻尼常数决定。这提供了对χ（3）的大小和转移依赖性、其饱和行为以及先前讨论的抵消问题的一致看法。
For the discussion of the size dependence of the third-order nonlinear susceptibility χ(3) for confined electronic systems, the result of numerical study is given for an exactly soluble model of noninteracting Frenkel excitons in a periodic chain. The case of pump-probe type nonlinear effect is explicitly treated in the long-wavelength approximation, and Im[χ(3)] is evaluated as a function of chain size N, transfer energy b, and damping constants. For a given value of b(N), there is an enhancement of χ(3) with increasing value of N(b), followed by a saturation behavior. The range of the enhancement is determined by the damping constants. This provides a consistent view of the size and transfer dependence of χ(3), its saturation behavior, and the previously discussed cancellation problem.