A Wavelength‐Tunable Perovskite Plasmonic Lasing Enabled by a Surface Plasmon Polaritons (SPPs) Nanocavity

ABSTRACT Perovskite plasmonic lasers form a unique class of ultracompact coherent luminescent sources with potential for transformative applications in super‐resolution imaging, display technologies, and on‐chip coherent light sources for nanophotonic integration. However, achieving low‐threshold operations such as continuous‐wave (CW) pumped perovskite plasmonic lasers at room temperature remains a challenge, which is mainly due to the inherently high losses in plasmonic nanocavities. Here, we report a room‐temperature, CW‐pumped perovskite plasmonic laser with a record‐low threshold of 2.26 mW/cm 2 . This breakthrough is achieved by using an optimized grating‐coupled surface plasmon polaritons (SPPs) nanocavity with suppressed losses that combines with the advantages of ultrahigh quality ( Q ) factor, intense resonance intensity, and modified interface, simultaneously. In addition, the angular dispersion characteristic of SPPs enables the wavelength‐tunable nanocavities. As a result, lasing actions with tunable wavelength and directional emissions are ensured by this SPPs nanocavity. By realising CW‐pumped perovskite lasing at room temperature with desired properties for plasmonic lasers, this work advances the development of plasmonic lasers and demonstrates effective manipulation of the luminescence of perovskites through a SPPs nanocavity.