Opt Lett. 2023 Feb 1;48(3):803-806. doi: 10.1364/OL.474808.
We have experimentally demonstrated the realization of an instantaneously reconfigurable Lieb photonic lattice with a flatband in a three-level Λ-type rubidium atomic configuration. Such a coherently controllable Lieb photonic lattice is optically induced by a coupling field possessing a spatially periodic intensity distribution (generated via a spatial light modulator) under the condition of electromagnetically induced transparency. The incident weak Gaussian probe field can experience discrete diffraction and the observed probe beam at the output surface of the medium exhibits the same Lieb pattern, verifying the formation of the refractive index with a Lieb profile inside the atomic vapor cell. The potential wells and the band structure of the Lieb photonic lattice can be effectively manipulated by easily tuning the frequency of the involved laser beams. The current work can promisingly pave the way for exploring the exotic dynamics as well as tunable photonic devices in Lieb photonic lattices.
我们通过实验演示了在三能级 Λ 型铷原子构型中实现具有平坦带的瞬时可重构的 Lieb 光子晶格。在电磁感应透明条件下，通过具有空间周期性强度分布的耦合场（通过空间光调制器产生）可以光学诱导出这种相干可控的 Lieb 光子晶格。入射弱高斯探测场可以经历离散衍射，并且在介质的输出表面观察到的探测光束呈现出相同的 Lieb 图案，验证了在原子蒸汽室内形成具有 Lieb 轮廓的折射率。通过轻松调谐所涉及的激光束的频率，可以有效地操纵 Lieb 光子晶格的势阱和能带结构。当前的工作为探索 Lieb 光子晶格中的奇异动力学和可调光子器件铺平了道路。
