Excitons and Nonlinear Optical Effects in Wide Gap II-VI Semiconductor Superlattices

该研究是对非线性光学的一种研究。 所选半导体超晶格的性质。 这项工作将 特别关注激子附近的光诱导变化 II-VI族化合物半导体如（Zn，Mn）Se和（Cd， Mn）Te。 这些材料的独特之处在于， 并且磁激发是光学可接近的。 拟议 研究联合收割机结合了两个方面的新的和先进的研究，第一， 利用复杂的皮秒瞬态光学技术， 飞秒的时间尺度，第二，新的光谱， 半导体层状超晶格结构。 基本部分 这项工作涉及到很大程度上未知的激子的特性 在这样的时间尺度上的动力学，而更多的应用部分集中在 在高密度下寻求瞬态非线性的增强 磁取向激子系统 长期影响 研究包括超快光开关的可能性， 逻辑元素

The proposed research is an investigation into the nonlinear optical properties of selected semiconductor superlattices. The work will specifically focus on optically induced changes near the excitonic resonances in II-VI compound semiconductors such as (Zn, Mn)Se and (Cd, Mn)Te. These materials are unique in that strongly coupled electronic and magnetic excitations are optically accessible. The proposed studies combine two aspects of new and advanced research, first, the use of sophisticated transient optical techniques on picosecond and femtosecond timescale, and second, the spectroscopy of novel ultrathin semiconductor layered superlattice structures. The basic portion of the work involves the characterization of the largely unknown exciton kinetics on such timescale while the more applied part focuses on the enhancement of the sought transient nonlinearities in a high density magnetically oriented exciton system. The longer term impact of this research includes possibilities for ultrafast optical switches and logic elements.