Many-body and nonequilibrium effects on relaxation oscillations in a quantum-dot microcavity laser
Many-body and nonequilibrium effects on relaxation oscillations in a quantum-dot microcavity laser
复制标题
量子点微腔激光器中弛豫振荡的多体和非平衡效应
DOI：
10.1063/1.3488004
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发表时间：
2010
影响因子：
4
通讯作者：
W. Chow
中科院分区：
文献类型：
--
作者：
B. Lingnau;K. Lüdge;E. Schöll;W. Chow
研究了多体和非平衡效应对量子点激光二极管动力学行为的影响。基于麦克斯韦-半导体-布洛赫方程的模拟表明，由于带隙重整化引起量子点分布的动态位移，导通延迟对初始腔失谐有很强的依赖性。发现增益开关行为对非均匀展宽不敏感，因为多体效应和自由载流子效应之间的平衡抑制了腔共振漂移。弛豫振荡阻尼和频率随非均匀展宽宽度的减小而增大。然而，与体阱和量子阱激光器相比，振荡阻尼的增加小于频率的增加。
We investigate many-body and nonequilibrium effects on the dynamical behavior of a quantum-dot laser diode. Simulations, based on the Maxwell-semiconductor-Bloch equations, show strong dependence of the turn-on delay on initial cavity detuning, because of a dynamical shift in the quantum-dot distribution caused by band gap renormalization. Gain switch behavior is found to be insensitive to inhomogeneous broadening, because the balancing between many-body and free-carrier effects inhibits a cavity resonance walk-off. Both the relaxation oscillation damping and frequency are found to increase with decreasing inhomogeneous broadening widths. However, in contrast to bulk and quantum-well lasers, oscillation damping increases less than the frequency.