Near-Field Coupling Effects in Mie-Resonant Photonic Structures and All-Dielectric Metasurfaces

We reveal that strong near-field coupling effects can be observed for dissimilar Mie-resonant dielectric meta-atoms and demonstrate that both properties and functionalities of high-index all-dielectric photonic structures can be controlled by engineering their geometry and changing the distance between meta-atoms thus enhancing the effective magnetic response. We describe dielectric dimers, quadrumers, and metasurfaces with a staggered structure of optically induced magnetic moments (the so-called "optical antiferromagnetism") and also demonstrate that a strong toroidal response can be introduced in metasurfaces by engineering asymmetric nanoparticle quadrumers as building blocks for novel designs in all-dielectric resonant meta-optics.