Enhanced Multiphoton Processes in Perovskite Metasurfaces

Yubin Fan, Pavel Tonkaev, Yuhan Wang, Qinghai Song*, Jiecai Han, Sergey V. Makarov*, Yuri Kivshar*, Shumin Xiao*

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    42 Citations (Scopus)

    Abstract

    Multiphoton absorption and luminescence are fundamentally important nonlinear processes for utilizing efficient light-matter interaction. Resonant enhancement of nonlinear processes has been demonstrated for many nanostructures; however, it is believed that all higher-order processes are always much weaker than their corresponding linear processes. Here, we study multiphoton luminescence from structured surfaces and, combining multiple advantages of perovskites with the concept of metasurfaces, we demonstrate that the efficiency of nonlinear multiphoton processes can become comparable to the efficiency of the linear process. We reveal that the perovskite metasurface can enhance substantially two-photon stimulated emission with the threshold being comparable with that of the one-photon process. Our modeling of free-carrier dynamics and exciton recombination upon nonlinear photoexcitation uncovers that this effect can be attributed to the local field enhancement in structured media, a substantial increase of the mode overlap, and the selection rules of two-photon absorption in perovskites.

    Original languageEnglish
    Pages (from-to)7191-7197
    Number of pages7
    JournalNano Letters
    Volume21
    Issue number17
    DOIs
    Publication statusPublished - 8 Sept 2021

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