A critical challenge in nanophotonics is developing scalable and versatile fabrication methods that can precisely control photonic and plasmonic properties across large areas without compromising optical performance. Recently, significant progress has been made in the synthesis of colloidal quantum dots (QDs) and plasmonic nanoparticles. These advances, combined with precise and defect‐free assembly approaches, have overcome longstanding limitations in fabrication. Our approach integrates the benefits of top‐down nanoimprint lithography with bottom‐up self‐assembly techniques, including template‐assisted self‐assembly (TASA), layer‐by‐layer (LbL) assembly, and physical vapor deposition. Through mode‐resolved photoluminescence (PL) analysis, supported by electromagnetic simulations, we identify previously unreported metal‐assisted hybrid guided‐mode resonances (MA‐hGMRs) at near‐normal incidence (approximately 1°). This mode exhibits a quality factor (Q‐factor) of up to 18.6 and yields PL enhancement nearly threefold. The centimeter‐scale metasurfaces also allow us to resolve MA‐GMR and Rayleigh‐anomaly surface‐plasmon‐polariton modes, which arise from specific combinations of the QD and gold nanoparticle (AuNP) layers. Structural characterization analyses verify that the layer thicknesses and grating profiles remain uniform across centimeter‐scale areas, which is crucial for achieving reproducible device performance. These correlations between structure and optical response provide practical guidelines for designing colloidal metasurfaces with tailored emission characteristics.
Seçkin et al. (Tue,) studied this question.