A CW‐Pumped Dye Nanolaser With an Optimized Nanocavity

作者：Yueyue Wei, Yang Yao, Yuanyuan Du, Ning Zeng, Ziqiu Chen, Bowen Liu · 发表于：Small · 年份：2024 · DOI：10.1002/smll.202410019 · 被引用次数：7 · 研究领域：Plasmonic and Surface Plasmon Research、Metamaterials and Metasurfaces Applications、Gold and Silver Nanoparticles Synthesis and Applications

Abstract Plasmonic nanolasers, which are promising coherent light sources for integrated photonics, super‐resolution imaging, and ultrasensitive sensing applications, face the challenge of high thresholds due to inherent losses in plasmonic nanocavities. While considerable efforts have been made to improve the Q factor, typically quantified by the full width at half maximum ( FWHM ), intensity ( ΔI ) is another critical feature of plasmonic resonance. However, the combined influence of both the Q factor and resonance intensity of a plasmonic nanocavity on nanolasing threshold has not been sufficiently explored, as experimentally controlling one variable while keeping the other constant is challenging. Here, an ultra‐low threshold plasmonic nanolaser is demonstrated by systematically optimizing the plasmonic nanocavity. By carefully controlling both the FWHMs and resonance intensities of the plasmonic resonators, a record low threshold of 2.6 µJ cm −2 for a dye‐based nanolaser is achieved at room temperature– an order of magnitude lower than previous records. In addition, nanolasing under continuous‐wave (CW) excitation is reported at room temperature gained by the same dye molecule. The results provide new insights into the design of high‐performance plasmonic nanolasers and offer a promising path toward realizing applications of nanoscale coherent light sources.