Band-edge emission enhancement in sputtered ZnO thin films with ultraviolet surface lattice resonances

Metallic nanostructures acting as optical nanoantennas can significantly enhance the photoluminescence (PL) of nearby emitters. Albeit luminescence enhancement factors several orders magnitude have been reported for quantum dots or molecules, in case bulk emitters plasmonic is strongly hindered by weak spatial overlap between active medium and electromagnetic modes nanoantenna. Here, we propose a solid-state ultraviolet emitter based on thin film zinc oxide (ZnO) coupled with an array aluminum (Al) nanoparticles. The Al nanorod designed to sustain surface lattice resonances (SLRs) near ultraviolet, which are hybrid exhibiting Fano-like lineshape narrowed linewidth relatively non-hybridized modes. By changing both period dimensions nanorods, generated SLR tuned either band-edge (NBE) emission ZnO excitation wavelength. We experimentally demonstrate that NBE be increased up factor 3 compared bare ZnO. underlying PL mechanisms investigated numerical simulations. also SLRs more efficient localized plasmon resonances.