Intensity fluctuations in bimodal micropillar lasers enhanced by quantum-dot gain competition
Intensity fluctuations in bimodal micropillar lasers enhanced by quantum-dot gain competition
复制标题
量子点增益竞争增强双峰微柱激光器的强度波动
DOI：
10.1103/physreva.87.053819
复制
发表时间：
2013
影响因子：
2.9
通讯作者：
S. Reitzenstein
中科院分区：
文献类型：
--
作者：
H.A.M. Leymann;C. Hopfmann;F. Albert;A. Foerster;M. Khanbekyan;C. Schneider;S. Höfling;A. Forchel;M. Kamp;J. Wiersig;S. Reitzenstein
我们研究了在有源区具有单层自组装量子点的双模微柱激光器的正交偏振腔模式之间的关联。当微激光器的一种发射模式呈现典型的S型输入-输出曲线时，第二种模式的输出强度随着注入电流的增大而饱和甚至减小。测量了光发射的光子自相关函数，证实了在阈值以上接近1的第一模激光的开始。相反，对于高于阈值的电流，对于另一种模式，探测到与过热值相关的强光子聚束。这一现象归因于共同增益材料引起的两个模的增益竞争，光子互相关测量证实了这一点，表明两个模的发射事件之间存在明显的反相关关系。实验研究与基于微观半导体理论的理论研究定性一致，我们将其推广到两个模与公共增益介质相互作用的情况。此外，我们用一个扩展到两个相互作用模的唯象生灭模型来处理这个问题，它揭示了每个模的光子几率分布具有双峰结构，表明了模在阈值附近的泵浦速率的切换行为。
We investigate correlations between orthogonally polarized cavity modes of a bimodal micropillar laser with a single layer of self-assembled quantum dots in the active region. While one emission mode of the microlaser demonstrates a characteristic S-shaped input-output curve, the output intensity of the second mode saturates and even decreases with increasing injection current above threshold. Measuring the photon autocorrelation functionof the light emission confirms the onset of lasing in the first mode withapproaching unity above threshold. In contrast, strong photon bunching associated with superthermal values ofis detected for the other mode for currents above threshold. This behavior is attributed to gain competition of the two modes induced by the common gain material, which is confirmed by photon cross-correlation measurements revealing a clear anticorrelation between emission events of the two modes. The experimental studies are in qualitative agreement with theoretical studies based on a microscopic semiconductor theory, which we extend to the case of two modes interacting with the common gain medium. Moreover, we treat the problem by a phenomenological birth-death model extended to two interacting modes, which reveals that the photon probability distribution of each mode has a double-peak structure, indicating switching behavior of the modes for pump rates around threshold.
半导体量子点中的光与物质相互作用理论
DOI：
--
发表时间：
2008
期刊：
影响因子：
--
作者：
C. Gies
通讯作者：
C. Gies