All-Inorganic CsPbBr_3 Nanowire Based Plasmonic Lasers

摘要

Plasmonic nanolaser holds great potential in breaking down the diffractionlimit of conventional optics to the deep sub-wavelength regime and inultrafast lasing dynamics. However, plasmonic laser devices are constrainedin practical applications due to their high cost and high thresholds.All-inorganic cesium lead halide perovskites are promising solutions fortheir excellent optical gain properties and high emission efficiency. In thiswork, high-quality single-crystalline CsPbBr_3 perovskite nanowires (NWs) aresynthesized by chemical vapor deposition method. The plasmonic lasing isachieved from the CsPbBr_3 nanowire based plasmonic devices with lasingthreshold down to ≈6.5 μJ cm~（−2） at room temperature. The highly polarizedemission parallel to nanowire axis and polarization-sensitive pump responseconfirm the plasmonic characteristic in these devices. Furthermore, timeresolvedphotoluminescence study suggests that the radiative recombinationlifetime of CsPbBr_3 NW is shortened by a factor of ≈6.14 due to Purcell effect.The lasing threshold of plasmonic device increases along with the nanowirelength, indicating greater potential in small size and integration in plasmonicdevice than its photonic counterparts. The results not only provide a solutionto fabricate low-cost nanowire based plasmonic lasers, but also advocate theprospect of all-inorganic perovskite nanowires as promising candidates inplasmonic-based devices.