Time-resolved amplified spontaneous emission in quantum dots
Time-resolved amplified spontaneous emission in quantum dots
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DOI：
10.1063/1.3529447
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发表时间：
2010-12
影响因子：
4
通讯作者：
J. Gomis-Bresco;Sabine Dommers-Völkel;O. Schöps;Y. Kaptan;O. Dyatlova;D. Bimberg;U. Woggon
中科院分区：
文献类型：
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作者：
J. Gomis-Bresco;Sabine Dommers-Völkel;O. Schöps;Y. Kaptan;O. Dyatlova;D. Bimberg;U. Woggon
在InGaAs/GaAs阱中量子点（DWELL）半导体光放大器的时间分辨实验中，基态（GS）种群的泵浦探针以及激发态（ES）种群的放大自发发射的补充测量，我们能够将早期的亚皮秒减相动力学与后期的皮秒种群弛豫动力学分离出来。我们观察到非线性GS脉冲放大和随后的ES种群下降之间有10 ps的延迟，这支持了在电泵浦量子点- dwell结构中直接的二维水库-GS捕获弛豫路径的优势。
In time-resolved experiments at InGaAs/GaAs quantum-dots-in-a-well (DWELL) semiconductor optical amplifiers, pump-probe of the ground state (GS) population, and complementary measurement of the amplified spontaneous emission of the excited state (ES) population, we are able to separate the early subpicosecond dephasing dynamics from the later picosecond population relaxation dynamics. We observe a 10 ps delay between the nonlinear GS pulse amplification and the subsequent ES population drop-off that supports the dominance of a direct two dimensional reservoir-GS capture relaxation path in electrically pumped quantum-dot-DWELL structures.