论文标题
在弱和强的耦合方案中统一的饱和度和双带过渡的双重性描述
Unified description of saturation and bistability of intersubband transitions in the weak and strong light-matter coupling regimes
论文作者
论文摘要
我们提出了插入在谐振器中的量子井的统一描述，无论是在弱和强的光结合方案中。我们证明了如何对吸收饱和度进行设计。特别是我们表明，饱和强度随着强耦合方案中的掺杂而线性增加，而在弱耦合中仍然独立掺杂。因此，对抗直觉，利用低饱和强度的最合适的区域不是超强耦合方案，而是在强度强的耦合开始时。我们进一步得出了出现双重性的明确条件。这项工作为尚未存在的超快中红外半导体饱和吸收镜（SESAMS）和BISCABLE Systems的途径设定了道路。例如，我们展示了如何设计一个饱和强度降低三个数量级的中红外SESAM，降低到约5 kW/cm2。
We propose a unified description of intersubband absorption saturation for quantum wells inserted in a resonator, both in the weak and strong light-matter coupling regimes. We demonstrate how absorption saturation can be engineered. In particular we show that the saturation intensity increases linearly with the doping in the strong coupling regime, while it remains doping independent in weak coupling. Hence, countering intuition, the most suitable region to exploit low saturation intensities is not the ultra-strong coupling regime, but is instead at the onset of the strong light-matter coupling. We further derive explicit conditions for the emergence of bistability. This work sets the path towards yet unexisting ultrafast mid-infrared semiconductor saturable absorption mirrors (SESAMs) and bistable systems. As an example, we show how to design a mid-infrared SESAM with a three orders of magnitude reduction in saturation intensity, down to about 5 kW/cm2.
