Surface Lattice Resonances Enable Spatially Unified Perovskite Lasing

Plasmonic‐perovskite heterostructures offer a compelling platform for nanolasers but face challenges in operational reproducibility as previous methods require precise pumping regions. Here, hybrid Ag/perovskite lattices is demonstrated that enable spatially unified lasing across the entire lattice with low thresholds, thereby eliminating the necessity for location‐defined pumping. The hybrid lattices are fabricated by growing CsPbBr 3 perovskite via chemical vapor deposition (CVD) on pre‐patterned Ag nanoparticle (NP) lattices, engineered to support surface lattice resonances (SLRs) spectrally aligned with the perovskite's photoluminescence (PL). Systematic tuning of the perovskite filling factor ( FF , the ratio of perovskite‐covered area to the lattice area) enables lasing at FF s as low as 0.6, with higher FF s enhancing SLRs to demonstrate variable thresholds as low as 34.2 µJ·cm − 2 . Notably, SLRs effectively homogenize the optical field, compensating for perovskite disorder and enabling spatially uniform lasing across the whole lattice with minimal threshold variations. This work establishes a scalable and promising platform of low‐threshold nanolasers for coherent light sources.