Water-resistant Subwavelength Perovskite Lasing from Transparent Silica-Based Nanocavity.

Great research efforts have been devoted to exploring the miniaturization of chip-scale coherent light sources possessing excellent lasing performance. Despite the indispensable role in Si photonics, SiO 2 is generally considered not contributing to the starting up and operation of integrated lasers. Here we demonstrate an extraordinary-performance subwavelength-scale perovskite vertical cavity laser with all-transparent SiO 2 cavity, whose cavity is ultra-simple and composed of only two parallel SiO 2 plates. By introducing a ligand-assisted thermally co-evaporation strategy, highly luminescent perovskite film with high reproducibility and excellent optical gain is grown directly on SiO 2 . Benefitting from their high-refractive-index contrast, low-threshold, high-quality factor, and single-mode lasing is achieved in subwavelength range of ∼120 nm, and verified by long-range coherence distance (115.6 μm) and high linear polarization degree (82%). More importantly, the subwavelength perovskite laser device could operate in water for 20 days without any observable degradation, exhibiting ultra-stable water-resistant performance. Our findings would provide a simple but robust and reliable strategy for the miniaturized on-chip lasers compatible with Si photonics. This article is protected by copyright. All rights reserved.