Room-Temperature Plasmonic Lasers with Quasi-2D Perovskite Gain Medium

Room-temperature lasers are pivotal for advancing optical communication and quantum technologies but face significant challenges, such as material instability and high lasing thresholds. To overcome these issues, we exploit the unique properties of quasi-2D perovskites and high-Q plasmonic nanostructures for both enhancing the optical gain and coupling strength. Our study introduces a stable, wavelength-tunable room-temperature single-mode laser, utilizing PEA₂Cs_n−1Pb_nBr₃n₊₁ quasi-2D perovskites (n=5, λ_PL = 518 nm) coupled with a waveguide-hybridized surface lattice resonance (SLR) mode composed of aluminum nanoparticle arrays. This configuration leverages the enhanced light-matter interaction of the SLR cavity, tailored <i>via </i><i>finite-difference</i><i> </i>time-domain (FDTD) simulations. Additionally, amplified spontaneous emission (ASE) from trap states in the quasi-2D perovskite significantly boosts optical gain in the system. The results confirm the laser’s performance and operational stability in an atmospheric environment; the gain medium maintained stable emission intensity up to 1.8x10⁶ excitation pulses. By adjusting the periodicity of the surface lattice resonance (SLR) nanostructures, we achieved a tunable lasing wavelength across a 20 nm spectral range. Our findings establish a low-cost, energy-efficient approach for scalable plasmonic lasing. This advancement not only broadens the understanding of plasmonic systems but also unlocks potential in next-generation photonic applications such as sensing, optical communication, and computation. Finally, we will discuss the detailed working mechanisms of the room-temperature nanolasers.