Abstract

In the past decades, plasmonics, which is the strong light-matter interaction based on the coupling between light and resonant electron density oscillations in metallic nanostructures, attracts lots of interest in the field of lasing as it enables strong light confinement in the near-field region at metal surfaces1,2. When metallic nanoparticles (NPs) are arranged into a two-dimensional lattice, the localized surface plasmon resonance (LSPR) from a single particle will couple with the in-plane diffractive mode, resulting in a narrow-linewidth surface lattice resonance (SLR)3,4. SLRs have been utilized to make plasmonic lattice lasers with reported lasing thresholds ranging from 10^-1 to 10⁰ mJ/cm². Since currently reported plasmonic lattice lasers are relying on dye-doped resists or solutions as gain media, replacement with more efficient gain materials is one of the keys to achieving lasers with lower thresholds. Solution-processed quantum dots (QDs), as one of the possible substitutes, have been studied as potential materials for gain media due to their compatibility with complex structures.

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