Dynamic all-optical memory switching based on atomic optical bistable behavior in a three level Λ-type atomic system
Dynamic all-optical memory switching based on atomic optical bistable behavior in a three level Λ-type atomic system
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DOI：
10.1088/1555-6611/ad1aa2
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发表时间：
2024-01
期刊：
影响因子：
1.2
通讯作者：
Haiqiang He;B. Fan;Min Xie
中科院分区：
文献类型：
--
作者：
Haiqiang He;B. Fan;Min Xie
从理论上研究了单向光学环形腔中三能级Λ类原子系统中原子的光学双稳性。研究了控制场的强度或失谐对AOB的影响，结果表明，由于多能级原子系统中的量子相干和干涉，控制场可以显著地改变原子的吸收、色散和非线性。因此，调节控制场的强度或失谐可以操纵开关的上、下阈值，以及双稳态磁滞回线的面积。根据AOB的可控性，我们设计了多种方案来实现固定腔输入的两条双稳曲线的高、低输出之间的动态全光开关。此外，动态全光存储开关可以通过增加用于控制场强度或失谐的脉冲序列来实现。选择适当的参数，如合作系数，可以显著提高开关的消光比。
We theoretically investigate the atomic optical bistability (AOB) in a three-level Λ-type atomic system confined in a unidirectional optical ring cavity. The role of the intensity or detuning of the control field on AOB is explored, and results show that absorption, dispersion, and nonlinearity can be modified significantly by the control field due to quantum coherence and interference in multilevel atomic systems. Thus, tuning the intensity or detuning of the control field can manipulate the switch-up and switch-down thresholds, as well as the area of the bistable hysteresis loop. According to the controllability of AOB, we design various schemes to realize dynamical all-optical switching between the high and low outputs of two bistable curves for a fixed cavity input. In addition, dynamical all-optical memory switching can be implemented by adding a pulse sequence for the intensity or detuning of the control field. For appropriate parameters, such as the cooperative coefficient, the extinction ratio of the switching can be improved dramatically.