论文标题
在弱耦合原子腔系统中相干的完美吸收
Coherent perfect absorption in a weakly coupled atom-cavity system
论文作者
论文摘要
我们基于一个弱耦合的原子腔系统研究了相干的完美吸收（CPA），该系统具有嵌入在空腔中的光学泵送的二阶非线性晶体（SOC）。我们的系统不需要强大的耦合，在以前的研究中通常需要CPA，但在某些系统中实现实验方面的挑战。 SOC的作用是引入可调型腔的可调节有效衰减速率，这可能导致CPA在弱耦合方面。所提出的系统表现出可行的行为，可在常规形状和非常规形状之间进行可切换的双重模式。通过改变SOC的性质，可以将CPA的操作点调整为内部或外部可容纳的机制。它也可以位于上部或下部稳定分支，甚至可以位于双磁滞循环的不稳定分支。但是，对于任何固定有效的衰减率，它与SOC的参数具有鲁棒性。我们的系统可能会应用于实现光学设备，例如弱耦合方案中的光学开关。
We study coherent perfect absorption (CPA) theoretically based on a weakly coupled atom-cavity system with an optically pumped second-order nonlinear crystal (SOC) embedded in the cavity. Our system does not require a strong coupling, which is often needed for CPA in previous studies but is challenging to implement experimentally in some systems. The role of the SOC is to introduce a tunable effective decay rate of the cavity, which can lead to CPA in the weak coupling regime. The proposed system exhibits bistable behaviors, with bistable patterns switchable between conventional and unconventional shapes. By varying the properties of the SOC, the operation point of CPA can be tuned to be inside or outside the bistable regime. It can also be located at the upper or the lower stable branch or even the unstable branch of the bistable hysteresis loop. It is however robust against the parameters of the SOC for any fixed effective decay rate. Our system can potentially be applied to realize optical devices such as optical switches in the weakly coupled regime.
