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

Abstract : Metallic nanostructures acting as optical nanoantennas can significantly enhance the photoluminescence (PL) of nearby emitters. Albeit luminescence enhancement factors of several orders of magnitude have been reported for quantum dots or molecules, in the case of bulk emitters the magnitude of the plasmonic enhancement is strongly hindered by the weak spatial overlap between the active medium and the electromagnetic modes of the nanoantenna. Here, we propose a solidstate ultraviolet emitter based on a thin film of zinc oxide (ZnO) coupled to an array of aluminum (Al) nanoparticles. The Al nanorod array is designed to sustain surface lattice resonances (SLRs) in the near ultraviolet, which are hybrid modes exhibiting a Fano-like lineshape with narrowed linewidth relatively to the non-hybridized plasmonic modes. By changing both the period of the array and the dimensions of the nanorods, the generated SLR is tuned either to the near band-edge (NBE) emission of the ZnO or to the excitation wavelength. We experimentally demonstrate that the NBE emission can be increased up to a factor of 3 compared to bare ZnO. The underlying PL enhancement mechanisms are experimentally investigated and compared with numerical simulations. We also demonstrate that SLRs are more efficient for ZnO luminescence enhancement compared to localized surface plasmon resonances.
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Submitted on : Wednesday, December 8, 2021 - 2:51:36 PM
Last modification on : Sunday, June 26, 2022 - 9:32:44 AM
Long-term archiving on: : Wednesday, March 9, 2022 - 6:44:55 PM

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Thomas Simon, Serguei Kochtcheev, Anna Rumyantseva, Jérémie Béal, Davy Gérard, et al.. Band-edge emission enhancement in sputtered ZnO thin films with ultraviolet surface lattice resonances. Journal of Applied Physics, American Institute of Physics, 2021, 130, pp.223103. ⟨10.1063/5.0073588⟩. ⟨hal-03470808⟩

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