Surface plasmon polaritons (SPP), which squeeze light at nanoscale, offer a new avenue to build sub-wavelength lasers. However, room-temperature SPP lasing especially in the blue-green region has been challenging due to strong metallic absorption. Here, we present room-temperature lasing at 535 nm from hybrid SPP confined in submicron dimension. To compensate for metallic loss, we employed high-gain lead halide perovskite (LHP) cuboid crystals as a gain medium and a 1.4-nm-thick alkanethiol layer coated on gold substrates (Fig A). We synthesized high quality all inorganic lead halide perovskite (CsPbBr<sub>3</sub>) having micron- and submicron-size using recently developed sonochemical synthesis. Self-assembled monolayers (SAMs) of alkanethiols were prepared by immersing a gold substrate into a solution of the desired thiol. The smallest SPP laser we observed is 830 nm in width and 500 nm in height. Both the LHP crystals and lipid insulators are self-assembled, ensuring atomically flat interfaces with low scattering loss and strong SPP confinement. The lasing SPP mode was measured to have a high group index of 22 and a high Q-factor of 200. The lasing threshold for nanosecond pumping was 11.6 mJ/cm<sup>2</sup>. The laser linewidth was 0.5 nm near at the lasing threshold. We also present finite-difference time-domain simulation corroborating the experimental results.

Submicron surface-plasmon-polariton perovskite laser

2019 Spring National Meeting

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