论文标题
辐射旋转偶极子和anapole激发，共同响应原子阵列
Radiative toroidal dipole and anapole excitations in collectively responding arrays of atoms
论文作者
论文摘要
环形偶极子代表经常被忽略的电磁激发，与标准的电和磁多极扩展不同。我们展示了如何使用强烈辐射耦合原子的简单排列来合成环形偶极子，在该偶极偶极子通过辐射过渡产生的环形拓扑，从而形成周围有效的多环电流伤口。我们扩展了用于制备DELAICALIGET集体激发模式的方法的协议，该模式由此类环形偶极子的合成晶格以及不辐射但振荡的电荷构型，动态anapole，为此，旋转偶极子的远场辐射被电动偶极子取消。
A toroidal dipole represents an often overlooked electromagnetic excitation distinct from the standard electric and magnetic multipole expansion. We show how a simple arrangement of strongly radiatively coupled atoms can be used to synthesize a toroidal dipole where the toroidal topology is generated by radiative transitions forming an effective poloidal electric current wound around a torus. We extend the protocol for methods to prepare a delocalized collective excitation mode consisting of a synthetic lattice of such toroidal dipoles and a non-radiating, yet oscillating charge-current configuration, dynamic anapole, for which the far-field radiation of a toroidal dipole is identically canceled by an electric dipole.
