The work investigates surprising dark lines and polarization singularities in momentum-space fluorescence patterns from plasmonic nanoantenna lattices. These features arise from destructive far-field interference between diffractively outcoupled TE and TM waveguide modes. JCMsuite's finite element method solver was used to efficiently compute the T-matrix of individual plasmonic scatterers, which was then integrated into a lattice reciprocity model to simulate and validate the complex angle- and polarization-resolved emission patterns.
D. Pal, A. F. Koenderink. Dark Lines and Polarization Singularities in Bright Metasurface-Enhanced Fluorescence. Laser Photonics Rev., e02199 (2025).