Mitigating radiative losses in resonant structures has been a target of extensive research in photonics, involving various concepts such as optical dark states, multipoles, anapoles, embedded eigenstates, as well as momentum- or symmetry-mismatched lattice resonances in periodic systems. Here, we explore the possibility of improving the quality factors of dispersive lattice resonances within the light cone of a plasmonic metasurface. In particular, we find that antisymmetric modes of a honeycomb lattice of isotropic metal nanoparticles have symmetry-protected degenerate band edges, whereas the same lattice composed of anisotropic nanoparticles has an off-normal bound state along one of the dispersive bands. In addition to theoretical calculations, we also present our preliminary experimental results on distributed feedback lasing in such systems.

Resonant Nanophotonics

Kolkowski, R., Kovaios, S., & Koenderink, F. (2020). Trapping light in resonant metasurfaces for plasmon lasing. In AIP Conference Proceedings (pp. 020060: 1–4). doi:10.1063/5.0031921