The optical field enhanced nonlinear optical (NLO) absorption of spin-coated 10-layer and 20-layer 1D photonic crystal structures is demonstrated. A significant 2.5 fold increase in the two-photon absorption coefficient is reported for multilayer structures as compared to a single layer of semiconductor nanocomposite (NC) having a comparable thickness. Under high-intensity illuminance, increased nonlinear absorption could be accredited to the confinement of the optical field due to the localization of intensity. The carefully engineered multilayer structures embedded with semiconductor NCs can provide an attractive approach to designing practical NLO limiters and switches.

中文翻译：

---

硫族化物纳米复合材料一维光子晶体的光场增强非线性光学性能

演示了旋涂 10 层和 20 层 1D 光子晶体结构的光场增强非线性光学 (NLO) 吸收。据报道，与具有相当厚度的单层半导体纳米复合材料（NC）相比，多层结构的双光子吸收系数显着增加了2.5倍。在高强度照度下，由于强度局部化，非线性吸收的增加可以归因于光场的限制。嵌入半导体 NC 的精心设计的多层结构可以为设计实用的 NLO 限制器和开关提供一种有吸引力的方法。