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首页> 外文期刊>Journal of Applied Physics >Optically Pumped Lasing From A Single Pillar Microcavity With Ingaas/gaas Quantum Well Potential Fluctuation Quantum Dots
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Optically Pumped Lasing From A Single Pillar Microcavity With Ingaas/gaas Quantum Well Potential Fluctuation Quantum Dots

机译：具有Ingaas / Gaas量子阱势能波动量子点的单柱微腔中的光泵激激光

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Here, an optical study is presented on cuboidal single pillar microresonators with a quantum-dot-like emitter formed from local fluctuations in the InGaAs/GaAs quantum well potential. By means of microphotoluminescence, emission spectra as a function of the excitation power density were recorded. In the low excitation spectra a number of sharp lines corresponding to the single quantum dots photoluminescence was observed. With increasing excitation power the spectra become dominated by the microcavity modes, on the background of which an intensive and narrow line appears when a certain threshold excitation power is exceeded. A threshold power corresponding to the onset of the superlinear emission intensity power dependence was determined, which is accompanied by a strong decrease in the emission mode linewidth, where both are the distinctive features of the lasinglike behavior. The threshold power density and the exponent of the superlinear part of the input-output characteristic increase with the pillar lateral size (d) and the quality factor (Q), however, they both decrease when plotted as a function of Q/d~2, which is the actual figure of merit of the spontaneous emission coupling factor (β). It shows the dominant influence of the volume change effect over the cavity Q (finesse). Thus, larger β values are assigned to the smaller micropillars, in spite of their lower Q values. A quantum dot character of the lasing has been confirmed in a temperature dependent experiment, which showed a number of emission intensity oscillations instead of the expected monotonic decay with the temperature increase, which is a fingerprint of the spectral tuning of the quantum dot emission spectrum through the optical cavity mode.
机译：在这里，对立方的单柱微谐振器进行了光学研究，该谐振器具有由InGaAs / GaAs量子阱电势的局部波动形成的量子点状发射器。通过微光致发光，记录了作为激发功率密度的函数的发射光谱。在低激发光谱中，观察到许多与单个量子点光致发光相对应的尖线。随着激发功率的增加，光谱由微腔模式主导，当超过某个阈值激发功率时，微腔模式在背景上出现一条密集而狭窄的线条。确定了与超线性发射强度功率依赖性的开始相对应的阈值功率，其伴随着发射模式线宽的强烈减小，其中这两者都是类似激光的行为的独特特征。阈值功率密度和输入输出特性的超线性部分的指数随立柱横向尺寸（d）和品质因数（Q）的增加而增加，但是当它们作为Q / d〜2的函数绘制时，它们都减小，这是自发发射耦合因子（β）的实际品质因数。它显示了体积变化效应对型腔Q（精细度）的主要影响。因此，尽管Q值较低，但较大的β值会分配给较小的微柱。激光的量子点特征已在与温度有关的实验中得到证实，该实验显示出一定数量的发射强度振荡，而不是随温度升高而预期的单调衰减，这是量子点发射光谱通过光腔模式。

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