Less Is More: Enhancement of Second-Harmonic Generation from Metasurfaces by Reduced Nanoparticle Density

Robert Czaplicki, Antti Kiviniemi, Mikko J. Huttunen, Xiaorun Zang, Timo Stolt, Ismo Vartiainen, Jérémy Butet, Markku Kuittinen, Olivier J.F. Martin, Martti Kauranen

    Tutkimustuotos: ArtikkeliScientificvertaisarvioitu

    48 Sitaatiot (Scopus)
    32 Lataukset (Pure)

    Abstrakti

    We investigate optical second-harmonic generation (SHG) from metasurfaces where noncentrosymmetric V-shaped gold nanoparticles are ordered into regular array configurations. In contrast to expectations, a substantial enhancement of the SHG signal is observed when the number density of the particles in the array is reduced. More specifically, by halving the number density, we obtain over 5-fold enhancement in SHG intensity. This striking result is attributed to favorable interparticle interactions mediated by the lattice, where surface-lattice resonances lead to spectral narrowing of the plasmon resonances. Importantly, however, the results cannot be explained by the improved quality of the plasmon resonance alone. Instead, the lattice interactions also lead to further enhancement of the local fields at the particles. The experimental observations agree very well with results obtained from numerical simulations including lattice interactions.

    AlkuperäiskieliEnglanti
    Sivut7709-7714
    Sivumäärä6
    JulkaisuNano Letters
    Vuosikerta18
    Numero12
    DOI - pysyväislinkit
    TilaJulkaistu - 12 jouluk. 2018
    OKM-julkaisutyyppiA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä

    Julkaisufoorumi-taso

    • Jufo-taso 3

    !!ASJC Scopus subject areas

    • Bioengineering
    • Chemistry(all)
    • Materials Science(all)
    • Condensed Matter Physics
    • Mechanical Engineering

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