Lasing in quantum-dot ensembles with sharp adjustable electronic shells
Lasing in quantum-dot ensembles with sharp adjustable electronic shells
复制标题
具有锐利可调节电子壳的量子点系综中的激光
DOI：
10.1063/1.124253
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发表时间：
1999
影响因子：
4
通讯作者：
Y. Feng
中科院分区：
文献类型：
--
作者：
S. Fafard;Z. Wasilewski;C. Allen;K. Hinzer;J. McCaffrey;Y. Feng
利用分子束外延生长的自组装量子点(QD)制备了具有多达五个定义良好的电子壳的量子点激光二极管。形状工程堆叠的自对准量子点具有改进的均匀性，用于增加有源区的增益。激光在小增益介质的上量子点壳层中观察到，当腔长较长时，激光向量子点基态发展。在77K下，对于2 mm激发态(p壳层)的腔体激光，获得了Jth=15 A/cm~2的阈值；对于n=3(d壳层)的1 mm腔体激光，获得了Jth=125 A/cm~2的阈值。在300K下，对于1 mm腔体，在n=4(f壳层)的激光作用下，Jth为490 A/cm~2。
Quantum-dot laser diodes with up to five well-defined electronic shells are fabricated using self-assembled quantum dots (QDs) grown by molecular-beam epitaxy. Shape-engineered stacks of self-aligned QDs with improved uniformity are used to increase the gain in the active region. Lasing is observed in the upper QD shells for small-gain media, and progresses towards the QD ground states for longer cavity lengths. We obtained at 77 K thresholds of Jth=15 A/cm2 for a 2 mm cavity lasing in the first excited state (p shell), and Jth=125 A/cm2 for a 1 mm cavity lasing in n=3 (d shell). At 300 K for a 1 mm cavity, Jth is 490 A/cm2 with lasing in n=4 (f shell).