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.

AIP
doi.org/10.1063/5.0031921
Resonant Nanophotonics

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