Carrier density driven lasing dynamics in ZnO nanowires
Carrier density driven lasing dynamics in ZnO nanowires
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DOI：
10.1088/0957-4484/27/22/225702
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发表时间：
2016-01
期刊：
影响因子：
3.5
通讯作者：
M. Wille;C. Sturm;T. Michalsky;R. Röder;C. Ronning;R. Schmidt‐Grund;M. Grundmann
中科院分区：
文献类型：
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作者：
M. Wille;C. Sturm;T. Michalsky;R. Röder;C. Ronning;R. Schmidt‐Grund;M. Grundmann
我们报告的时间激光动力学的高品质氧化锌纳米线使用的时间分辨显微光致发光技术。的激光特性和相应的衰减常数的温度依赖性表明的电子-空穴等离子体的形成是潜在的增益机制在所考虑的温度范围从10 K到300 K。我们发现，依赖于温度的发射起始时间（t上）强烈地依赖于激发功率，并成为最小的激光制度，值低于5 ps。此外，观察到的红移的主要激光模式在时间上的载流子密度诱导的变化后的折射率色散的激发激光脉冲的定性讨论。通过扩展现有的计算不同温度下载流子密度依赖的复折射率的模型，支持了这一理论。该模型与实验观测相吻合，并可靠地描述了激发激光脉冲后折射率的演变。
We report on the temporal lasing dynamics of high quality ZnO nanowires using the time-resolved micro-photoluminescence technique. The temperature dependence of the lasing characteristics and of the corresponding decay constants demonstrate the formation of an electron–hole plasma to be the underlying gain mechanism in the considered temperature range from 10 K to 300 K. We found that the temperature-dependent emission onset-time ( t on ) strongly depends on the excitation power and becomes smallest in the lasing regime, with values below 5 ps. Furthermore, the observed red shift of the dominating lasing modes in time is qualitatively discussed in terms of the carrier density induced change of the refractive index dispersion after the excitation laser pulse. This theory is supported by extending an existing model for the calculation of the carrier density dependent complex refractive index for different temperatures. This model coincides with the experimental observations and reliably describes the evolution of the refractive index after the excitation laser pulse.