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首页> 外文会议>Conference on Quantum Dot Devices and Computing Jan 21, 2002, San Jose, USA >Spatio-Temporal Dynamics and Fluctuations in Quantum Dot Lasers: Mesoscopic Theory and Modeling
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Spatio-Temporal Dynamics and Fluctuations in Quantum Dot Lasers: Mesoscopic Theory and Modeling

机译：量子点激光器的时空动力学和涨落：介观理论和建模

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摘要

We present a mesoscopic theory for the spatio-temporal carrier- and light field dynamics in quantum dot lasers based on spatially resolved semiconductor Bloch equations describing the dynamics of electrons and holes in each quantum dot. The Bloch equations are dynamically coupled to spatially resolved wave equations for the counterpropagating light fields and to a diffusion equation describing the carrier dynamics in the wetting layer of the quantum dot laser. These quantum dot Maxwell-Bloch equations (QD-MBEs) self-consistently consider the dynamic changes in the carrier distributions and the inter-level dipoles together with the spatially varying carrier-light field dynamics. Intradot scattering via emission and absorption of phonons, as well as the scattering with the carriers and phonons of the surrounding wetting layer are dynamically included on a mesoscopic level. Spatial fluctuations in size and energy levels of the quantum dots and irregularities in the spatial positioning of the quantum dots in the laser structure are simulated via statistical methods. Numerical simulations on the basis of the QD-MBEs reveal a complex carrier dynamics and a characteristic interplay of spontaneous and stimulated emission. For a specific set of QD-parameters the results of the modeling allow an analysis and interpretation of e.g. saturation effects and dynamic pulse shaping in quantum dot lasers.
机译：我们基于空间分辨半导体Bloch方程，描述了每个量子点中电子和空穴的动力学，提出了量子点激光器中时空载流子和光场动力学的介观理论。 Bloch方程与反向传播光场的空间分辨波方程以及描述量子点激光器润湿层中载流子动力学的扩散方程动态耦合。这些量子点麦克斯韦-布洛赫方程（QD-MBE）自洽地考虑了载流子分布和能级偶极子的动态变化以及空间变化的载光场动力学。在介观水平上动态地包括通过声子的发射和吸收进行的点内散射以及与周围润湿层的载流子和声子的散射。通过统计方法模拟了量子点的尺寸和能量水平的空间波动以及激光结构中量子点的空间定位中的不规则性。基于QD-MBE的数值模拟显示了复杂的载流子动力学以及自发和受激发射的特征相互作用。对于一组特定的QD参数，建模的结果允许对例如量子点激光器中的饱和效应和动态脉冲整形。

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