Qi Chuan-Zhao, Zheng Jia-Rui, Tong Yuan-Hang, Li Ruo-Nan, Wang Dan, Huang Liang-Hui, Zhou Hai-Tao
Sanli Honors College, Shanxi University, Taiyuan 030006, China.
State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-Electronics, School of Physics and Electronic Engineering, Shanxi University, Taiyuan 030006, China.
Nanomaterials (Basel). 2024 Jul 23;14(15):1236. doi: 10.3390/nano14151236.
We developed and experimentally realized a scheme of optical nonreciprocity (ONR) by using degenerate two-level atoms embedded in an optical ring cavity. For the degenerate transition F = 4 ↔ F = 3, we first studied the cavity-transmission property in different coupling field configurations and verified that under the strong-coupling regime, the single-dark-state peak formed by electromagnetically induced transparency (EIT) showed ONR. The stable ground-state Zeeman coherence for Λ-chains involved in the degenerate two-level system was found to be important in the formation of intracavity EIT. However, different from the three-level atom-cavity system, in the degenerate two-level system, the ONR effect based on intracavity EIT occurred only at a low probe intensity, because the cavity-atom coupling strength was weakened in the counter-propagating probe and coupling field configuration. Furthermore, ONR transmission with a high contrast and linewidth-narrowing was experimentally demonstrated.
我们通过使用嵌入光学环形腔中的简并二能级原子，开发并通过实验实现了一种光学非互易性（ONR）方案。对于简并跃迁F = 4 ↔ F = 3，我们首先研究了不同耦合场配置下的腔传输特性，并验证了在强耦合 regime 下，由电磁诱导透明（EIT）形成的单暗态峰显示出ONR。发现简并二能级系统中涉及的Λ链的稳定基态塞曼相干在腔内EIT的形成中很重要。然而，与三能级原子 - 腔系统不同，在简并二能级系统中，基于腔内EIT的ONR效应仅在低探测强度下发生，因为在反向传播的探测和耦合场配置中腔 - 原子耦合强度减弱。此外，通过实验证明了具有高对比度和线宽变窄的ONR传输。
