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Efficient nonlinear metasurfaces by using multiresonant high-Q plasmonic arrays

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Original languageEnglish
Pages (from-to)E30-E35
JournalJournal of the Optical Society of America B: Optical Physics
Issue number7
Publication statusPublished - 2019
Publication typeA1 Journal article-refereed


We numerically investigate second-harmonic generation from multiresonant plasmonic metasurfaces by designing an array consisting of L-shaped aluminum nanoparticles that simultaneously supports two surface lattice resonances with relatively high quality factors (>100). Using an approach based on the nonlinear discrete-dipole approximation, we predict an over million-fold enhancement of the emitted second-harmonic intensity from a particle at the center of the metasurface compared to an individual particle and estimate that conversion efficiencies of around 10-5 could be achievable from the surface. Our results are an important step towards making nonlinear metasurfaces practical for nonlinear applications, such as for frequency conversion.

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Field of science, Statistics Finland