Glicenstein Antoine, Ferioli Giovanni, Šibalić Nikola, Brossard Ludovic, Ferrier-Barbut Igor, Browaeys Antoine
Université Paris-Saclay, Institut d'Optique Graduate School, CNRS, Laboratoire Charles Fabry, 91127 Palaiseau, France.
Phys Rev Lett. 2020 Jun 26;124(25):253602. doi: 10.1103/PhysRevLett.124.253602.
We experimentally study resonant light scattering by a one-dimensional randomly filled chain of cold two-level atoms. By a local measurement of the light scattered along the chain, we observe constructive interferences in light-induced dipole-dipole interactions between the atoms. They lead to a shift of the collective resonance despite the average interatomic distance being larger than the wavelength of the light. This result demonstrates that strong collective effects can be enhanced by structuring the geometrical arrangement of the ensemble. We also explore the high intensity regime where atoms cannot be described classically. We compare our measurement to a mean-field, nonlinear coupled-dipole model accounting for the saturation of the response of a single atom.
我们通过实验研究了由一维随机填充的冷二能级原子链产生的共振光散射。通过对沿链散射光的局部测量，我们观察到了原子间光致偶极 - 偶极相互作用中的相长干涉。尽管平均原子间距大于光的波长，但这些干涉导致了集体共振的偏移。这一结果表明，通过构建系综的几何排列可以增强强集体效应。我们还探索了原子不能用经典方式描述的高强度区域。我们将测量结果与考虑单个原子响应饱和的平均场非线性耦合偶极模型进行了比较。
