Optically induced antiferromagnetic order in dielectric metasurfaces with complex supercells

Metasurfaces are 2D planar lattices of nanoparticles that allow the manipulation of incident light proper-ties. Because of that attribute, metasurfaces are promising candidates to replace bulky optical components. Traditionally, metasurfaces are made from a periodic arrangement of identical unit cells. However, more degrees of freedom are accessible if an increasing number of structured unit cells are combined. The present study explores a type of dielectric metasurface with complex supercells composed of Mie-resonant dielectric nanocylinders and nanoscale rings. We numerically and experimentally demonstrate the signature of an optical response that relies on the structures sustaining staggered optically induced magnetic dipole moments. The optical response is asso-ciated with an optical antiferromagnetism. The optical antiferromagnetism exploits the presence of pronounced coupling between dissimilar Mie-resonant dielectric nanoparticles. The coupling is manipulated by engineering the geometry and distance between the nanoparticles, which ultimately enhances their effective magnetic response. Our results suggest possible applications in resonant nanophotonics by broadening the modulation capabilities of metasurfaces. (c) 2023 Optica Publishing Group

Automated summary

Introduced metasurfaces as promising candidates to replace bulky optical components, and explored dielectric metasurfaces with complex supercells composed of Mie-resonant dielectric nanocylinders and nanoscale rings. Demonstrated the signature of an optical response relying on staggered optically induced magnetic dipole moments, and suggested possible applications in resonant nanophotonics by broadening the modulation capabilities of metasurfaces.