Perovskite Quantum Dot Lasing in a Gap-Plasmon Nanocavity with Ultralow Threshold

作者：Yu‐Hung Hsieh, Bo‐Wei Hsu, Kang-Ning Peng, Kuan-Wei Lee, Chih‐Wei Chu, Shu‐Wei Chang, Hao‐Wu Lin, Ta‐Jen Yen, Yu‐Jung Lu · 发表于：ACS Nano · 年份：2020 · DOI：10.1021/acsnano.0c04224 · 被引用次数：109 · 研究领域：Perovskite Materials and Applications、Gold and Silver Nanoparticles Synthesis and Applications、Plasmonic and Surface Plasmon Research

Lead halide perovskite materials have recently received considerable attention for achieving an economic and tunable laser owing to their solution-processable feature and promising optical properties. However, most reported perovskite-based lasers operate with a large lasing-mode volume, resulting in a high lasing threshold due to the inefficient coupling between the optical gain medium and cavity. Here, we demonstrate a continuous-wave nanolasing from a single lead halide perovskite (CsPbBr 3 ) quantum dot (PQD) in a plasmonic gap-mode nanocavity with an ultralow threshold of 1.9 Wcm –2 under 120 K. The calculated ultrasmall mode volume (∼0.002 λ 3 ) with a z -polarized dipole and the significantly large Purcell enhancement at the corner of the nanocavity inside the gap dramatically enhance the light-matter interaction in the nanocavity, thus facilitating lasing. The demonstration of PQD nanolasing with an ultralow-threshold provides an approach for realizing on-chip electrically driven lasing and integration into on-chip plasmonic circuitry for ultrafast optical communication and quantum information processing.