作　　者： ; ; ; ; ;

机构地区： 中山大学物理科学与工程技术学院光电材料与技术国家重点实验室

出　　处： 《物理学报》 2003年第9期2293-2297,共5页

摘　　要： 研究周期多层量子阱 (MQW)结构的线性光学吸收特性与共振入射脉冲能量宽度、结构层数以及周期的关系 .结果表明 :窄共振脉冲激发下的Bragg结构在层数达到某一值后 ,总吸收由随层数单调增加变为单调减少 ;在非Bragg排列条件下则一直单调增加 .通过对结构内电磁场强度分布情况的分析解释了以上结果的来源 。 Linear absorptive properties of the periodic multi-quantum well ( MQW) structures are studied. It is found that the absorption is determined by the interplay of pulse widths, layer number N and periods. A threshold existing in N divides Bragg absorption into a rising and dropping regions. The corresponding maximum is an independent constant. Absorptions for non-Bragg arrangement keeps monotonously increasing with its first part almost coinciding with the corresponding Bragg absorptions. This demonstrates a dramatic Bragg suppression, which never appears in the rising region. Further more I the Beer's law is proved to be still exactly suitable for periodic structures.

关 键 词： 周期多层量子阱 结构 光吸收特性 电场分布 压缩效应 激子 半导体

领　　域： [理学] [理学]