Light-Cone Surface Lattice Resonances Enable Rotationally Tunable Edge Lasing

This talk describes how the discovery of light-cone surface lattice resonances (SLRs) enables tunable edge-emitting lasing. We theoretically predict that optical modes on the light cone of an appropriately designed plasmonic nanoparticle lattice show in-plane scattering. The scattering direction was probed by using dye molecules as local gain media for edge-emitting lasing from the lattice. By investigating the light-cone SLR modes outside the first Brillouin zone, we observed multiple SLR modes along different lattice directions. Incorporating dye molecules with broadband photoluminescence into the lattices resulted in multi-color lasing emission with different in-plane directions. Our discoveries provide a laser design strategy to realize tunable lasing wavelength by rotating plasmonic nanoparticle lattices.