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高性能非互易光子器件能够有效提升光量子操控、信息处理以及量子模拟的效率。放大的光信号可以增强并隔离量子系统输出的微弱信号，避免敏感量子系统受反向散射噪声等影响，是高性能光子器件的核心技术。在我们先前的工作（Opt.Express 31，38228）中，基于四波混频增益并利用耦合场强度随位置线性变化实现了单向反射光放大的动力学调控。本文我们巧妙设计了简单的三能级闭合回路相干增益原子系统，创新性地设置耦合场强度随位置阶梯型变化来破坏极化率空间对称性实现了完美非互易反射光放大。相比之下，耦合场强度阶梯型变化在实验上更容易调节，大大降低了实验难度。特别地，该系统引入了相位调制。通过改变相位能够切换探测光增益和吸收的频率域，对反射光放大的调节更具灵活性。High performance non-reciprocal photonic devices can improve the efficiency of optical quantum manipulation, information processing, and quantum simulation effectively. The enhanced optical signal can simultaneously amplify the weak signal output by the quantum system and isolate the sensitive quantum system from the back-scattered external noise, which is the core technology of high-performance photonic devices. In our previous work (Opt. Express 31, 38228), we have achieved dynamic control of unidirectional reflection amplification based on four-wave mixing gain and utilizing the linear variation of coupling field intensity with position. In this article, we ingeniously design a simple three-level closed loop coherent gain atomic system, innovatively setting the intensity of coupling field varying with position by step shape to break the spatial symmetry of probe susceptibility, and achieving perfect non-reciprocal reflection amplification. In contrast, the stepped variation of coupling field intensity is easier to adjust in experiments, this can reduce the difficulty in the experiment greatly. Specifically, the system introduces phase modulation. By changing the phase, the frequency region of probe gain and absorption can be switched, which makes the modulation of reflection amplification more flexible.
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Keywords:
- Perfect non-reciprocal /
- Reflection amplification /
- Relative phases
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