具有集成可饱和吸收体的延迟耦合神经形态微腔激光器中的再生矢量呼吸子
Regenerative vectorial breathers in a delay-coupled neuromorphic microlaser with integrated saturable absorber
AI总结：
本文研究延迟耦合神经形态微腔激光器中再生脉冲的偏振动力学，实验观测到矢量呼吸子，并通过数值模型揭示其源于偏振各向异性引起的对称性破缺分岔，为可控偏振脉冲源和神经形态片上计算提供新思路。
摘要：
我们报道了耦合到外部反馈镜的、具有集成可饱和吸收体的微柱激光器中再生光脉冲的偏振动力学。该延迟自耦合微腔激光器工作在可激发状态，在该状态下它以超阈值强度再生入射脉冲——从而产生脉冲串，其脉冲间周期近似等于反馈延迟时间，类似于自耦合生物神经元。我们报道了偏振角中矢量呼吸子的实验观测，其表现为线偏振强度分量的调制，而总强度没有显著调制。对合适模型的数值分析表明，观测到的偏振模式竞争是由偏振各向异性引起的对称性破缺分岔的结果。我们的模型很好地再现了观测到的实验结果，并预测了作为偏振各向异性参数和泵浦参数函数的不同状态。我们相信这些发现对于制造具有可控性质的柔性偏振脉冲源以及神经启发片上计算应用具有重要意义，在后者中偏振可以用于以新颖的方式编码或处理信息。
英文摘要：
We report on the polarization dynamics of regenerative light pulses in a micropillar laser with integrated saturable absorber coupled to an external feedback mirror. The delayed self-coupled microlaser is operated in the excitable regime, where it regenerates incident pulses with a supra-threshold intensity -- resulting in a pulse train with inter-pulse period approximately given by the feedback delay time, in analogy with a self-coupled biological neuron. We report the experimental observation of vectorial breathers in polarization angle, manifesting themselves as a modulation of the linear polarized intensity components without significant modulation of the total intensity. Numerical analysis of a suitable model reveals that the observed polarization mode competition is a consequence of symmetry-breaking bifurcations induced by polarization anisotropy. Our model reproduces well the observed experimental results and predicts different regimes as a function of the polarization anisotropy parameters and the pump parameter. We believe that these findings are relevant for the fabrication of flexible sources of polarized pulses with controlled properties, as well as for neuroinspired on-chip computing applications, where the polarization may be used to encode or process information in novel ways.
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