Optical band engineering via vertical stacking of honeycomb plasmonic lattices

Inspired by recent advances in atomic homo and heterostructures, we consider the vertical stacking of plasmonic lattices as a new degree freedom to create coupled system showing modified optical response concerning monolayer. The precise design geometrical parameters two honeycomb tailors interaction among their metallic nanoparticles. Based on similarity lattice symmetry, analogies can be drawn with stacked crystals, such graphene. We use multipolar spectral representation study stack's near-field regime, emphasizing symmetry properties. strong coupling certain bands shows up anticrossings dispersion diagram, resulting polarization exchange interacting bands. By leveraging these effects, engineer intensity distribution. Additionally, lifting band degeneracy at specific points Brillouin zone is obtained consequent opening minigaps. These effects are understood quantifying nanospheres belonging same different sublattices, well interlayer intralayer nanoparticle interactions. Differences case also analyzed explained terms matrix. Finally, predict absorption spectrum projected orthogonal linear polarizations.