可见光与银间二聚体的无电偶极相互作用
Electric dipole-free interaction of visible light with silver metadimers
摘要：
在亚波长大小的粒子中，光诱导的多极矩的阶数高于电偶极子通常是可以忽略不计的小，这使得光-物质相互作用可以在电偶极子近似下准确地处理。在这项工作中，我们表明，在一个特别设计的元原子，一个磁盘元二聚体，电四极和磁偶极子可以是唯一的可激发多极。对于单个间二聚体和这种颗粒的周期性阵列，在窄但可调谐的可见光光谱范围内实现了该条件。由间二聚体散射的电磁场与由电偶极子产生的电磁场根本不同。因此，由这种二聚体组成的超材料将表现出不寻常的光学特性。
英文摘要：
In subwavelength-sized particles, light-induced multipole moments of orders higher than the electric dipole are usually negligibly small, which allows for the light-matter interaction to be accurately treated within the electric dipole approximation. In this work we show that in a specially designed meta-atom, a disc metadimer, the electric quadrupole and magnetic dipole can be the only excitable multipoles. This condition is achieved in a narrow but tunable spectral range of visible light both for individual metadimers and for a periodic array of such particles. The electromagnetic fields scattered by the metadimers fundamentally differ from those created by electric dipoles. A metamaterial composed of such metadimers will therefore exhibit unusual optical properties.
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