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.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2003年第9期2293-2297,共5页
Acta Physica Sinica
基金
国家重点基础研究特别项目(批准号 :19990 75 2 0 0 )
国家自然科学基金 (批准号 :90 2 0 10 2 7)资助的课题~~
