Ultrafast circular polarization oscillations in spin-polarized vertical-cavity surface-emitting laser devices
Ultrafast circular polarization oscillations in spin-polarized vertical-cavity surface-emitting laser devices
复制标题
自旋偏振垂直腔表面发射激光器件中的超快圆偏振振荡
DOI：
--
复制
发表时间：
2010
期刊：
影响因子：
--
通讯作者：
T. Ackemann
中科院分区：
文献类型：
--
作者：
N. Gerhardt;M. Li;H. Jaehme;H. Soldát;M. Hofmann;T. Ackemann
自旋偏振激光器为未来器件提供了新的令人鼓舞的可能性。研究了室温下电泵浦垂直腔面发射激光器在附加自旋注入后的偏振动力学。我们发现，圆偏振度表现出更快的动力学比发射光。此外，实验结果表明，强阻尼的超快圆偏振振荡由于自旋注入的振荡频率约为11 GHz的依赖于在VCSEL器件的双折射。我们比较我们的实验结果与理论计算的基础上速率方程。这使我们能够预测无阻尼长期持续的超快偏振振荡，揭示了超快调制应用的自旋VCSEL的潜力。
Spin-polarized lasers offer new encouraging possibilities for future devices. We investigate the polarization dynamics of electrically pumped vertical-cavity surface-emitting lasers after additional spin injection at room temperature. We find that the circular polarization degree exhibits faster dynamics than the emitted light. Moreover the experimental results demonstrate a strongly damped ultrafast circular polarization oscillation due to spin injection with an oscillation frequency of approximately 11GHz depending on the birefringence in the VCSEL device. We compare our experimental results with theoretical calculations based on rate-equations. This allows us to predict undamped long persisting ultrafast polarization oscillations, which reveal the potential of spin-VCSELs for ultrafast modulation applications.