Passive Nonlinear Optical Isolators Bypassing Dynamic Reciprocity,Physical Review Applied

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Passive Nonlinear Optical Isolators Bypassing Dynamic Reciprocity
Physical Review Applied ( IF 3.8 ) Pub Date : 2021-07-19 , DOI: 10.1103/physrevapplied.16.014046
Yiqi Hu _{1,

2} , Yihong Qi ₁ , Yu You _{1,

2} , Shicheng Zhang ₁ , Gongwei Lin ₁ , Xiaolin Li ₁ , Jiangbin Gong ₃ , Shangqing Gong _{1,

4} , Yueping Niu _{1,

4}

Affiliation

Magnetic-free optical isolators are critical components for the realization of integrated optical systems. The underlying physics of passive nonlinear optical isolators is not solely about breaking the Lorentz reciprocity without requiring any external bias. Indeed, one major obstacle to the operation of self-Kerr-type nonlinear optical isolators is the so-called dynamic reciprocity, of which a serious outcome is that a backward signal cannot be isolated in the presence of a forward strong signal. In this work, we advocate the concept of velocity-selective nonlinearity to bypass such dynamic reciprocity. Using a proof-of-principle platform with warm rubidium atoms in an asymmetric cavity, we experimentally achieve the isolation of a backward signal in the presence of a strong forward signal, with experimental observations in agreement with our theoretical simulations. This work has thus made one essential step towards functioning Kerr-type passive optical isolators.

中文翻译：

绕过动态互易性的无源非线性光隔离器

无磁光隔离器是实现集成光学系统的关键组件。无源非线性光隔离器的基础物理不仅仅是在不需要任何外部偏置的情况下打破洛伦兹互易性。事实上，自克尔型非线性光隔离器工作的一个主要障碍是所谓的动态互易性，其严重后果是在存在前向强信号的情况下无法隔离后向信号。在这项工作中，我们提倡速度选择性非线性的概念来绕过这种动态互易性。使用在不对称腔中带有热铷原子的原理验证平台，我们通过实验实现了在存在强前向信号的情况下后向信号的隔离，实验观察与我们的理论模拟一致。因此，这项工作为实现克尔型无源光隔离器的功能迈出了重要的一步。

更新日期：2021-07-20

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