Efficient prediction of terahertz quantum cascade laser dynamics from steady-state simulations
Efficient prediction of terahertz quantum cascade laser dynamics from steady-state simulations
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DOI：
10.1063/1.4918993
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发表时间：
2015-04-20
影响因子：
4
通讯作者：
Rakic, A. D.
中科院分区：
文献类型：
--
作者：
Agnew, G.;Grier, A.;Rakic, A. D.
基于束缚到连续有源区的太赫兹频率量子级联激光器(THzQCL)由于其大量的量子态而难以建模。我们提出了一个计算高效的简化速率方程(RE)模型，该模型再现了实验观察到的太赫兹功率随驱动电流和热沉温度的变化。我们还给出了在一定范围的驱动电流下的动态(时间域)模拟，并预测随着电流接近光电流曲线的峰值，调制带宽将增加，就像在中红外QCL中实验观察到的那样。我们用全速率方程模型计算了载流子寿命、增益和注入效率与温度和偏置的关系。模拟的阈值电流、发射功率和截止电流与温度的关系只需一个参数，即界面粗糙度，就能在全分辨率下得到准确的再现。因此，该模型可用于QCL设计的快速动态模拟。(C)2015 AIP出版有限责任公司。
Terahertz-frequency quantum cascade lasers (THz QCLs) based on bound-to-continuum active regions are difficult to model owing to their large number of quantum states. We present a computationally efficient reduced rate equation (RE) model that reproduces the experimentally observed variation of THz power with respect to drive current and heat-sink temperature. We also present dynamic (time-domain) simulations under a range of drive currents and predict an increase in modulation bandwidth as the current approaches the peak of the light-current curve, as observed experimentally in mid-infrared QCLs. We account for temperature and bias dependence of the carrier lifetimes, gain, and injection efficiency, calculated from a full rate equation model. The temperature dependence of the simulated threshold current, emitted power, and cut-off current are thus all reproduced accurately with only one fitting parameter, the interface roughness, in the full REs. We propose that the model could therefore be used for rapid dynamical simulation of QCL designs. (C) 2015 AIP Publishing LLC.