Conservation of Pseudoangular Momentum in the Radiative Emission and Optical Excitation of Valley-Polarized Surface Lattice Resonances
Surface lattice resonances (SLRs) are collective polaritonic excitations in nanoparticle arrays, with band-edge states enabling symmetry-based control of radiation including scattering, photoluminescence, conventional and polariton lasing, and condensation. Here, we show that the integer pseudoangular momentum (PAM) of valley-polarized SLRs in parity-broken hexagonal arrays of honeycomb and kagome arrangements is directly encoded in the phase and polarization structure of their emitted electromagnetic fields. The effects of parity-symmetry breaking on SLR PAM and the localized surface plasmon angular momentum associated with the individual nanoparticles composing the array are investigated, and an explicit link between these quantities is established. Leveraging electromagnetic reciprocity, we further propose a structured optical field possessing the same array symmetries and integer PAM as the underlying SLRs and demonstrate theoretically and numerically that it selectively couples to valley-polarized SLRs with matching quantized PAM. Our results establish PAM-resolved light-matter interactions involving lattice resonances as providing new opportunities for symmetry-selective nanophotonic control, chiral light generation, and angular-momentum-engineered metasurfaces.