Cooperative eigenmodes and scattering in one-dimensional atomic arrays
Cooperative eigenmodes and scattering in one-dimensional atomic arrays
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DOI：
10.1103/physreva.94.043844
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发表时间：
2016-10-24
影响因子：
2.9
通讯作者：
Adams, Charles S.
中科院分区：
文献类型：
--
作者：
Bettles, Robert J.;Gardiner, Simon A.;Adams, Charles S.
偶极子之间的集体耦合可以显着改变介质的光学响应。这种效应很大程度上取决于介质的几何形状和光的偏振。使用经典的耦合偶极子模型，在这里我们研究由弱激光场驱动的相互作用原子偶极子的一维阵列的最简单情况。改变驱动场的偏振和方向使我们能够分别解决超辐射、次辐射、红移和蓝移本征模，并观察不同模式之间强烈的类法诺干涉。协作特征向量可以通过最近邻居偶极子之间的相位差来表征，相位差的范围从所有与其最近邻居同相振荡到所有异相振荡。研究作为原子数和晶格间距函数的特征值行为，我们发现无限原子链的某些特征模式具有与两个镜子之间的单个原子相同的衰减率。我们观察到的效应为集体控制介质的光学响应提供了一个框架，可以深入了解更复杂的几何形状的行为，并为腔 QED 的偶极模拟提供进一步的证据。
Collective coupling between dipoles can dramatically modify the optical response of a medium. Such effects depend strongly on the geometry of the medium and the polarization of the light. Using a classical coupled dipole model, here we investigate the simplest case of one-dimensional arrays of interacting atomic dipoles driven by a weak laser field. Changing the polarization and direction of the driving field allows us to separately address superradiant, subradiant, redshifted, and blueshifted eigenmodes, as well as observe strong Fano-like interferences between different modes. The cooperative eigenvectors can be characterized by the phase difference between nearest-neighbor dipoles, ranging from all oscillating in phase to all oscillating out of phase with their nearest neighbors. Investigating the eigenvalue behavior as a function of atom number and lattice spacing, we find that certain eigenmodes of an infinite atomic chain have the same decay rate as a single atom between two mirrors. The effects we observe provide a framework for collective control of the optical response of a medium, giving insight into the behavior of more complicated geometries, as well as providing further evidence for the dipolar analog of cavity QED.