Zhang Zhaoyang, Feng Jingliang, Liu Xing, Sheng Jiteng, Zhang Yiqi, Zhang Yanpeng, Xiao Min
Opt Lett. 2018 Feb 15;43(4):919-922. doi: 10.1364/OL.43.000919.
With two sets of standing-wave fields built in a thermal rubidium vapor cell, we have established a controllable photonic crystal with periodic gain in a coherently prepared N-type four-level atomic configuration. First, the photonic lattice constructed by a resonant standing-wave coupling field results in a spatially modulated susceptibility and makes the signal field diffract in a discrete manner under the condition of electromagnetically induced transparency. Then, with the addition of the standing-wave pump field, the N-type atomic medium can induce a periodic Raman gain on the signal field, which can be effectively controlled by tuning the pertinent atomic parameters. The experimental demonstration of such a real-time reconfigurable photonic crystal structure with periodic Raman gain can pave the way for realizing desired applications predicted in the gain-modulated periodic optical systems.
通过在热铷蒸汽池中构建两组驻波场，我们在相干制备的N型四能级原子构型中建立了一种具有周期性增益的可控光子晶体。首先，由共振驻波耦合场构建的光子晶格会导致空间调制的极化率，并使信号场在电磁诱导透明条件下以离散方式衍射。然后，通过添加驻波泵浦场，N型原子介质可以在信号场上诱导周期性拉曼增益，这可以通过调整相关原子参数来有效控制。这种具有周期性拉曼增益的实时可重构光子晶体结构的实验演示可为实现增益调制周期性光学系统中预测的理想应用铺平道路。
