Plasmonic nanolaser with tunable emitting wavelength near 1 µm

Surface plasmon polaritons (SPPs) can produce a confined electromagnetic field near the metal–dielectric interface, allowing energy to be compressed into a scale smaller than the optical diffraction limit. The characteristic enables the fabrication of sub-wavelength-sized, ultra-low-threshold, ultrafast, specific polarization, room-temperature lasing nanolasers, which is especially meaningful for the lasers emitting long wavelength light. In this work, we developed a Cs 0.1 MA 0.9 SnI 3 perovskite plasmonic laser based on a metal–insulator–semiconductor (MIS) structure, demonstrating a low threshold of 281 μJ cm −2 , a tunable emitting wavelength from 973 to 1023 nm, strong mode confinement at the cutoff height of 90 nm, and a rapid response lifetime of 29.43 ps. Our study represents the first, to the best of our knowledge, theoretical design and experimental production of perovskite plasmonic nanolaser with a tunable emitting wavelength near 1 μm, filling a significant research gap and paving the way for the application of perovskite nanolasers in optoelectronic integration and information technology.