文献类型：期刊文献

英文题名：Optical precursors with tunneling-induced transparency in asymmetric quantum wells

作者：Peng, Yandong[1,2];Niu, Yueping[1];Qi, Yihong[1,2];Yao, Haifeng[1,2];Gong, Shangqing[1,3]

机构：[1]Chinese Acad Sci, Shanghai Inst Opt & Fine Mech, State Key Lab High Field Laser Phys, Shanghai 201800, Peoples R China;[2]Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China;[3]E China Univ Sci & Technol, Dept Phys, Shanghai 200237, Peoples R China

年份：2011

卷号：83

期号：1

外文期刊名：PHYSICAL REVIEW A

收录：;EI(收录号：20110313589639);WOS:【SCI-EXPANDED(收录号:WOS:000286734300002)】；

基金：This work was supported by the National Basic Research Program of China (973 Program) under Grant No. 2006CB806000, the National Natural Science Foundation of China (Grants No. 60708008, No. 60978013, and No. 60921004) the Shanghai Commission of Science and Technology with Grant No. 10530704800.

语种：英文

外文关键词：Quantum well lasers - Dispersions - III-V semiconductors - Resonant tunneling - Transparency

摘要：A scheme for separating optical precursors from a square-modulated laser pulse through an asymmetric double AlxGa1-xAs/GaAs quantum-well structure via resonant tunneling is proposed. Destructive interference inhibits linear absorption, and a tunneling-induced transparency (TIT) window appears with normal dispersion, which delays the main pulse; then optical precursors are obtained. Due to resonant tunneling, constructive interference for nonlinear susceptibility is created. The enhanced dispersion in a narrow TIT window is about one order of magnitude larger than that of the linear case. In this case, the main pulse is much delayed and the precursor signals are easier to obtain. Moreover, the main pulse builds up due to the gain introduced by the enhanced cross-nonlinearity.