Surface lattice resonance lasers with epitaxial InP gain medium

Surface lattice resonance\n(SLR) lasers, where the gain is supplied\nby a thin-film active material and the feedback comes from multiple\nscattering by plasmonic nanoparticles, have shown both low threshold\nlasing and tunability of the angular and spectral emission at room\ntemperature. However, typically used materials such as organic dyes\nand QD films suffer from photodegradation, which hampers practical\napplications. Here, we demonstrate photostable single-mode lasing\nof SLR modes sustained in an epitaxial solid-state InP slab waveguide.\nThe nanoparticle array is weakly coupled to the optical modes, which\ndecreases the scattering losses and hence the experimental lasing\nthreshold is as low as 94.99 ± 0.82 μJ cm<sup>2</sup> pulse<sup>–1</sup>. The nanoparticle periodicity defines the lasing\nwavelength and enables tunable emission wavelengths over a 70 nm spectral\nrange. Combining plasmonic nanoparticles with an epitaxial solid-state\ngain medium paves the way for large-area on-chip integrated SLR lasers\nfor applications, including optical communication, optical computing,\nsensing, and LiDAR.