Collective effects and coupling phenomena in resonant optical metasurfaces: introduction

In the periodic arrays of nano-objects, the interplay between localized resonances supported by the individual nano-objects and the diffracted orders of the array produces a collective resonance called a lattice mode or a surface lattice resonance (SLR). Besides analyses of SLRs, there are many efforts to understand the various modes sustained by metasurfaces, from the individual meta-atom to the entire metasurface. This feature issue highlights current research on collective resonances and optical coupling in various arrangements of nano-objects, including periodic lattices, nanostructured arrays, and metasurfaces. (C) 2019 Optical Society of America