Efficient and Tunable Photoinduced Honeycomb Lattice in an Atomic Ensemble
Efficient and Tunable Photoinduced Honeycomb Lattice in an Atomic Ensemble
复制标题
原子系综中高效且可调谐的光致蜂窝晶格
DOI：
10.1002/lpor.201800050
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发表时间：
2018-09-01
影响因子：
11
通讯作者：
Qiu, Cheng-Wei
中科院分区：
文献类型：
--
作者：
Wen, Feng;Zhang, Xun;Qiu, Cheng-Wei
通信网络中的全光器件和电路对具有可控光学特性的人工周期结构提出了很高的要求。然而，在固体材料中实现的AP通常是不可调谐的，并且固有地具有不变的光子带隙。本文报道了利用多光束干涉方法在原子系综中形成一种新颖的蜂窝晶格。与固体材料中形成的蜂窝晶格不同，这种光致蜂窝晶格的吸收/色散系数和光子带隙等光学性质可以通过双光子失谐和拉比频率进行有效的调谐，从而得到振幅型和相位型蜂窝晶格。基于双光子量子成像方法，研究了蜂窝晶格的近场衍射。结果发现，只需调整两个探测器扫描成像光束的方式，就可以调节衍射图的分辨率。此外，通过调节晶格的光学性质可以大大增强图案的对比度。这种具有可调谐特性的光学蜂窝晶格可以在少光子水平上应用于全光开关，并为光学拓扑绝缘体的产生和操纵铺平了道路。
Artificial periodic structures (APS) with controllable optical properties are highly demanded in all-optical devices and circuits in communication networks. However, APS realized in solid materials are usually non-tunable and inherently possess immutable photonic bandgap. In this article, a novel honeycomb lattice in an atomic ensemble by utilizing the multi-beam interference method is reported. Unlike the honeycomb lattice formed in solid materials, the optical properties of this photoinduced honeycomb lattice, such as the absorption/dispersion coefficients and the photonic bandgap can be efficiently tuned by two-photon detuning and Rabi frequency, resulting in both amplitude- and phase- type honeycomb lattice. Based on the two-photon quantum-imaging method, the near-field diffraction of the honeycomb lattice is also investigated. It is found that the resolution of the diffraction pattern is tunable by simply adjusting the manner of the two detectors scanning across the imaging beams. In addition, the contrast of the pattern can be greatly enhanced by tuning the optical properties of the lattice. Such an optical honeycomb lattice with tunable properties could find applications in all-optical switching at the few photons level and paves the way for the generation and manipulation of optical topological insulators.